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(10x+20)+(3x+4)=180
We move all terms to the left:
(10x+20)+(3x+4)-(180)=0
We get rid of parentheses
10x+3x+20+4-180=0
We add all the numbers together, and all the variables
13x-156=0
We move all terms containing x to the left, all other terms to the right
13x=156
x=156/13
x=12
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