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(X)+(X+26)=90
We move all terms to the left:
(X)+(X+26)-(90)=0
We get rid of parentheses
X+X+26-90=0
We add all the numbers together, and all the variables
2X-64=0
We move all terms containing X to the left, all other terms to the right
2X=64
X=64/2
X=32
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