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-3x+31=8x-57
We move all terms to the left:
-3x+31-(8x-57)=0
We get rid of parentheses
-3x-8x+57+31=0
We add all the numbers together, and all the variables
-11x+88=0
We move all terms containing x to the left, all other terms to the right
-11x=-88
x=-88/-11
x=+8
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