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X+2(X+1)=38
We move all terms to the left:
X+2(X+1)-(38)=0
We multiply parentheses
X+2X+2-38=0
We add all the numbers together, and all the variables
3X-36=0
We move all terms containing X to the left, all other terms to the right
3X=36
X=36/3
X=12
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