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X+(X+2)+(X+4)=69
We move all terms to the left:
X+(X+2)+(X+4)-(69)=0
We get rid of parentheses
X+X+X+2+4-69=0
We add all the numbers together, and all the variables
3X-63=0
We move all terms containing X to the left, all other terms to the right
3X=63
X=63/3
X=21
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