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6x-31=2x+13
We move all terms to the left:
6x-31-(2x+13)=0
We get rid of parentheses
6x-2x-13-31=0
We add all the numbers together, and all the variables
4x-44=0
We move all terms containing x to the left, all other terms to the right
4x=44
x=44/4
x=11
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