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(x+15)+(3x+5)=180
We move all terms to the left:
(x+15)+(3x+5)-(180)=0
We get rid of parentheses
x+3x+15+5-180=0
We add all the numbers together, and all the variables
4x-160=0
We move all terms containing x to the left, all other terms to the right
4x=160
x=160/4
x=40
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