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(13x+11)+(7x+9)=180
We move all terms to the left:
(13x+11)+(7x+9)-(180)=0
We get rid of parentheses
13x+7x+11+9-180=0
We add all the numbers together, and all the variables
20x-160=0
We move all terms containing x to the left, all other terms to the right
20x=160
x=160/20
x=8
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