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(4x+30)+(4x+110)=180
We move all terms to the left:
(4x+30)+(4x+110)-(180)=0
We get rid of parentheses
4x+4x+30+110-180=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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