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(13x+9)+(5x-9)=180
We move all terms to the left:
(13x+9)+(5x-9)-(180)=0
We get rid of parentheses
13x+5x+9-9-180=0
We add all the numbers together, and all the variables
18x-180=0
We move all terms containing x to the left, all other terms to the right
18x=180
x=180/18
x=10
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