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(7x+20)+(5x+10)=180
We move all terms to the left:
(7x+20)+(5x+10)-(180)=0
We get rid of parentheses
7x+5x+20+10-180=0
We add all the numbers together, and all the variables
12x-150=0
We move all terms containing x to the left, all other terms to the right
12x=150
x=150/12
x=12+1/2
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