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(x+20)+3x=180
We move all terms to the left:
(x+20)+3x-(180)=0
We add all the numbers together, and all the variables
3x+(x+20)-180=0
We get rid of parentheses
3x+x+20-180=0
We add all the numbers together, and all the variables
4x-160=0
We move all terms containing x to the left, all other terms to the right
4x=160
x=160/4
x=40
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