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-7(x-8)=-2x+31
We move all terms to the left:
-7(x-8)-(-2x+31)=0
We multiply parentheses
-7x-(-2x+31)+56=0
We get rid of parentheses
-7x+2x-31+56=0
We add all the numbers together, and all the variables
-5x+25=0
We move all terms containing x to the left, all other terms to the right
-5x=-25
x=-25/-5
x=+5
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