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(x-13)+(x+15)=180
We move all terms to the left:
(x-13)+(x+15)-(180)=0
We get rid of parentheses
x+x-13+15-180=0
We add all the numbers together, and all the variables
2x-178=0
We move all terms containing x to the left, all other terms to the right
2x=178
x=178/2
x=89
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