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(15x+20)+(8x+91)=180
We move all terms to the left:
(15x+20)+(8x+91)-(180)=0
We get rid of parentheses
15x+8x+20+91-180=0
We add all the numbers together, and all the variables
23x-69=0
We move all terms containing x to the left, all other terms to the right
23x=69
x=69/23
x=3
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