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X+(X+8)+2X=84
We move all terms to the left:
X+(X+8)+2X-(84)=0
We add all the numbers together, and all the variables
3X+(X+8)-84=0
We get rid of parentheses
3X+X+8-84=0
We add all the numbers together, and all the variables
4X-76=0
We move all terms containing X to the left, all other terms to the right
4X=76
X=76/4
X=19
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