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(4x+20)+(3x+30)=180
We move all terms to the left:
(4x+20)+(3x+30)-(180)=0
We get rid of parentheses
4x+3x+20+30-180=0
We add all the numbers together, and all the variables
7x-130=0
We move all terms containing x to the left, all other terms to the right
7x=130
x=130/7
x=18+4/7
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