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(X+10)+(X-10)=180
We move all terms to the left:
(X+10)+(X-10)-(180)=0
We get rid of parentheses
X+X+10-10-180=0
We add all the numbers together, and all the variables
2X-180=0
We move all terms containing X to the left, all other terms to the right
2X=180
X=180/2
X=90
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