6x+5(x+9y)+7y simplify

get the X's on the same side of the equation by subtracting 3x from both sides, then get the constants on the same side by subtracting 5 from each side. You'll simplify it to 6x-3x=17-5, resulting in 3x=12 or x=4...

2x + 7y - 14 = 0

One equation in 2 unknowns has many solutions. Generally you can just substitute x = 1,2,3,4,5 etc and find y. Let us stick to simple outcomes

7y = 14 - 2x
x = 7 y = 0
x = -7 y = 4
x = 14 y = -2
x = -14 y = 6

Do the operation 3*2=6. Put the 6 in front of x. 6 is the coefficient
The result, in simplified form, is 6x

x=-2

If you're asking how to do this on a particular calculator, please specify the make and mode. If this is homework, be sure to show your work.

Replace with Champion CJ-7Y or RCJ--7Y spark
plug and tighten securely with a 3/4 inch
socket wrench. Spark plug gap should be
0.025 inches
R stands for resistor on the RCJ-7Y. Either plug will work.
PDF of Owners Manual
If you have other questions about your saw, there is an 800# at the top of PDF.
Hope this helps.

OK, you just have to put those values into the equation, do the math, and see if it works.

-6 * 5/6 - 7 * (-2) = 9 does it?

-5 - (-14) = -5 + 14 = 9 yes it does

You can (and probably should) always check a solution by testing this way. The definition of a solution is a value or set of values that cause the equation to work out. If the test had failed (say we had gotten -6 = 9 before, which is obviously wrong), we'd know that the values weren't a solution.

-42x^2 - 36/x^2 + 18x + 47/48x^2 - 4

I am confident that this is the simplified form.

This is very basic scientific calculator and you cannot use it with variables.
As to your equation (if you want to solve it) it is much simpler to do so with pen and paper.

Write it as
3y-6=-7y +4
Take the 6 from the left to the right where it becomes +6, Thus
3y=-7y+4+6
3y=-7y+10

Take the -7y term from the right to the left side, where it becomes +7y
3y+7y=10 or 10y=10.
The solution is clearly y=1.

6x+6=4x+12
Since 4x contains the variable to solve for, move it to the left-hand side of the equation by subtracting 4x from both sides.
6x+6-4x=12
Since 6x and -4x are like terms, add -4x to 6x to get 2x.
2x+6=12
Since 6 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 6 from both sides.
2x=-6+12
Add 12 to -6 to get 6.
2x=6
Divide each term in the equation by 2.
(2x)/(2)=(6)/(2)
Simplify the left-hand side of the equation by canceling the common factors.
x=(6)/(2)
Simplify the right-hand side of the equation by simplifying each term.
x=3

Good Luck