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7-31x=-2x
We move all terms to the left:
7-31x-(-2x)=0
We get rid of parentheses
-31x+2x+7=0
We add all the numbers together, and all the variables
-29x+7=0
We move all terms containing x to the left, all other terms to the right
-29x=-7
x=-7/-29
x=7/29
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