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X+4(-2+3X)=31
We move all terms to the left:
X+4(-2+3X)-(31)=0
We add all the numbers together, and all the variables
X+4(3X-2)-31=0
We multiply parentheses
X+12X-8-31=0
We add all the numbers together, and all the variables
13X-39=0
We move all terms containing X to the left, all other terms to the right
13X=39
X=39/13
X=3
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