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-7x-77=-13x+115
We move all terms to the left:
-7x-77-(-13x+115)=0
We get rid of parentheses
-7x+13x-115-77=0
We add all the numbers together, and all the variables
6x-192=0
We move all terms containing x to the left, all other terms to the right
6x=192
x=192/6
x=32
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