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(X+10)+(X+5)=180
We move all terms to the left:
(X+10)+(X+5)-(180)=0
We get rid of parentheses
X+X+10+5-180=0
We add all the numbers together, and all the variables
2X-165=0
We move all terms containing X to the left, all other terms to the right
2X=165
X=165/2
X=82+1/2
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