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(x+10)+(5x+30)+(4x-20)=180
We move all terms to the left:
(x+10)+(5x+30)+(4x-20)-(180)=0
We get rid of parentheses
x+5x+4x+10+30-20-180=0
We add all the numbers together, and all the variables
10x-160=0
We move all terms containing x to the left, all other terms to the right
10x=160
x=160/10
x=16
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