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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
2x-38=0
We move all terms containing x to the left, all other terms to the right
2x=38
x=38/2
x=19
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