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(X+13)+(X)=180
We move all terms to the left:
(X+13)+(X)-(180)=0
We add all the numbers together, and all the variables
X+(X+13)-180=0
We get rid of parentheses
X+X+13-180=0
We add all the numbers together, and all the variables
2X-167=0
We move all terms containing X to the left, all other terms to the right
2X=167
X=167/2
X=83+1/2
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