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10x-(2x-7)=31
We move all terms to the left:
10x-(2x-7)-(31)=0
We get rid of parentheses
10x-2x+7-31=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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