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5x-31=x-7
We move all terms to the left:
5x-31-(x-7)=0
We get rid of parentheses
5x-x+7-31=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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