It looks like you have more "open" parentheses than you have "close" parenthesis. You should make sure to put the last parenthesis in so that the whole equation is something like 24-((24-(3/8*24))*2/3+((3/8*24))) -- notice there are 3 parentheses at the end here.
Once you fix the error with the parenthesis, then it should give you 5 as the correct answer.
http://www.wolframalpha.com/input/?i=24-%28%2824-%283%2F8*24%29%29*2%2F3%2B%28%283%2F8*24%29%29%29
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