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4x-31=-2x-7
We move all terms to the left:
4x-31-(-2x-7)=0
We get rid of parentheses
4x+2x+7-31=0
We add all the numbers together, and all the variables
6x-24=0
We move all terms containing x to the left, all other terms to the right
6x=24
x=24/6
x=4
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