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(6x+20)+(4x+20)=180
We move all terms to the left:
(6x+20)+(4x+20)-(180)=0
We get rid of parentheses
6x+4x+20+20-180=0
We add all the numbers together, and all the variables
10x-140=0
We move all terms containing x to the left, all other terms to the right
10x=140
x=140/10
x=14
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