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(12x+20)+(4x)=180
We move all terms to the left:
(12x+20)+(4x)-(180)=0
We add all the numbers together, and all the variables
4x+(12x+20)-180=0
We get rid of parentheses
4x+12x+20-180=0
We add all the numbers together, and all the variables
16x-160=0
We move all terms containing x to the left, all other terms to the right
16x=160
x=160/16
x=10
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