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(3x+20)+(4x+50)=180
We move all terms to the left:
(3x+20)+(4x+50)-(180)=0
We get rid of parentheses
3x+4x+20+50-180=0
We add all the numbers together, and all the variables
7x-110=0
We move all terms containing x to the left, all other terms to the right
7x=110
x=110/7
x=15+5/7
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