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(X)+(X+2)+(X+3)=87
We move all terms to the left:
(X)+(X+2)+(X+3)-(87)=0
We get rid of parentheses
X+X+X+2+3-87=0
We add all the numbers together, and all the variables
3X-82=0
We move all terms containing X to the left, all other terms to the right
3X=82
X=82/3
X=27+1/3
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