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(X+7)+(2X+19)=80
We move all terms to the left:
(X+7)+(2X+19)-(80)=0
We get rid of parentheses
X+2X+7+19-80=0
We add all the numbers together, and all the variables
3X-54=0
We move all terms containing X to the left, all other terms to the right
3X=54
X=54/3
X=18
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