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(x-20)+2x=180
We move all terms to the left:
(x-20)+2x-(180)=0
We add all the numbers together, and all the variables
2x+(x-20)-180=0
We get rid of parentheses
2x+x-20-180=0
We add all the numbers together, and all the variables
3x-200=0
We move all terms containing x to the left, all other terms to the right
3x=200
x=200/3
x=66+2/3
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