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4x+239=13x-13
We move all terms to the left:
4x+239-(13x-13)=0
We get rid of parentheses
4x-13x+13+239=0
We add all the numbers together, and all the variables
-9x+252=0
We move all terms containing x to the left, all other terms to the right
-9x=-252
x=-252/-9
x=+28
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