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x-(4x-7)=31
We move all terms to the left:
x-(4x-7)-(31)=0
We get rid of parentheses
x-4x+7-31=0
We add all the numbers together, and all the variables
-3x-24=0
We move all terms containing x to the left, all other terms to the right
-3x=24
x=24/-3
x=-8
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