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(13x-10)+(7x+10)=180
We move all terms to the left:
(13x-10)+(7x+10)-(180)=0
We get rid of parentheses
13x+7x-10+10-180=0
We add all the numbers together, and all the variables
20x-180=0
We move all terms containing x to the left, all other terms to the right
20x=180
x=180/20
x=9
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