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X+(X+13)=153
We move all terms to the left:
X+(X+13)-(153)=0
We get rid of parentheses
X+X+13-153=0
We add all the numbers together, and all the variables
2X-140=0
We move all terms containing X to the left, all other terms to the right
2X=140
X=140/2
X=70
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