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(20x+15)+(6x+9)=180
We move all terms to the left:
(20x+15)+(6x+9)-(180)=0
We get rid of parentheses
20x+6x+15+9-180=0
We add all the numbers together, and all the variables
26x-156=0
We move all terms containing x to the left, all other terms to the right
26x=156
x=156/26
x=6
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