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(X+12)+(2X+4)=72
We move all terms to the left:
(X+12)+(2X+4)-(72)=0
We get rid of parentheses
X+2X+12+4-72=0
We add all the numbers together, and all the variables
3X-56=0
We move all terms containing X to the left, all other terms to the right
3X=56
X=56/3
X=18+2/3
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