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6x-57=2x+31
We move all terms to the left:
6x-57-(2x+31)=0
We get rid of parentheses
6x-2x-31-57=0
We add all the numbers together, and all the variables
4x-88=0
We move all terms containing x to the left, all other terms to the right
4x=88
x=88/4
x=22
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