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(X+63)+2X=90
We move all terms to the left:
(X+63)+2X-(90)=0
We add all the numbers together, and all the variables
2X+(X+63)-90=0
We get rid of parentheses
2X+X+63-90=0
We add all the numbers together, and all the variables
3X-27=0
We move all terms containing X to the left, all other terms to the right
3X=27
X=27/3
X=9
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