Advance lever and shutter stuck how do I fix it

Take out the batteries.

Use or buy a brand new battery from store that sell lot of them.

Do not get from store that only has a few, meaning they have been sitting there for years.

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Your camera is in cocked position with shutter fully cocked and that is why you cannot advance the film advance lever. Set the shutter to x position ( on your shutter speed dial on the right hand side and top of your camera ) . The shutter should release and then you should be able to advance the film advance lever.

The Pentax is a easy fix, maybe.. If you feel comfortable removing the bottom cover, then remove the 3 cross point screws. The battery, if installed will be loose. Looking at the bottom section of the camera, locate the tripod socket. On on side is the battery compartment, the other an L shaped lever. Under the L shaped lever is a brass plate with a slot in it. In that slot is another lever that has a spring going through the end eyelet. Move that lever toward the front of the camera until it latches on the L shaped lever above. Then try the release.

The first thing to try on the X700 is fresh batteries. Clean the battery cap and contacts with a pencil eraser.

The film is either at the end or stuck. The shutter will not release unless the film advance lever has gone all the way and back.
Make a note of the frame counter. Rewind the film and remove it from the camera (When you feel the film to come loose from the receiving spool, stop rewinding to prevent the end of the film to disappear inside the can. This way you can reload it if it was stuck in the middle.) If the film was completely exposed, take it to be developed.
With the empty camera, try to advance the lever and release the shutter. If this works, the problem was the film and not the camera. Everything is fine. If the problem persists, take it to be repaired.
If the film was stuck in the middle, load it again into the camera. With the lense cap on (preferably in a dark room or similar) 'shoot' as many 'empty' frames as you had on the counter plus two more. Finish the film and develop the pictures.
If the film stucks again at the same place, rewind it and develop normally. It was a bad film.
Hope this helped you to solve the problem.

Check the batteries first. The electromagnetic shutter requires power to function. To free up the shutter and advance lever, rotate the command switch to "M90" (if I recall). That should re-set the shutter and allow you to advance the lever mechanically.

needs repairing at a qualified shop
when was it last cleaned or serviced ?
if you think the camera is worthy, since its old how much is it worth to you vs a new one

When you press on the shutter release does it "click"? A few hard taps with the end of your finger onto the shutter reelase button may unjam it if it is stuck...

No, it is not the battery. My guess is that the film leader did not stay in the take-up spool and is now bunched up around it. Try rewinding the film carefully as you normally would but remember that you are only rewinding a small portion of the length. You can even just open the film door and start over. You will only loose 3 or 4 frames on the roll.