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(x-20)+(x-20)*2=180
We move all terms to the left:
(x-20)+(x-20)*2-(180)=0
We multiply parentheses
(x-20)+2x-40-180=0
We get rid of parentheses
x+2x-20-40-180=0
We add all the numbers together, and all the variables
3x-240=0
We move all terms containing x to the left, all other terms to the right
3x=240
x=240/3
x=80
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