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(5x+20)+(2x-15)=180
We move all terms to the left:
(5x+20)+(2x-15)-(180)=0
We get rid of parentheses
5x+2x+20-15-180=0
We add all the numbers together, and all the variables
7x-175=0
We move all terms containing x to the left, all other terms to the right
7x=175
x=175/7
x=25
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