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(x)+(x+20)+(200-3x)=180
We move all terms to the left:
(x)+(x+20)+(200-3x)-(180)=0
We add all the numbers together, and all the variables
x+(x+20)+(-3x+200)-180=0
We get rid of parentheses
x+x-3x+20+200-180=0
We add all the numbers together, and all the variables
-1x+40=0
We move all terms containing x to the left, all other terms to the right
-x=-40
x=-40/-1
x=+40
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