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(x)+(x+20)+(220-3x)=360
We move all terms to the left:
(x)+(x+20)+(220-3x)-(360)=0
We add all the numbers together, and all the variables
x+(x+20)+(-3x+220)-360=0
We get rid of parentheses
x+x-3x+20+220-360=0
We add all the numbers together, and all the variables
-1x-120=0
We move all terms containing x to the left, all other terms to the right
-x=120
x=120/-1
x=-120
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