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X+(X+20)+(210-3X)=270
We move all terms to the left:
X+(X+20)+(210-3X)-(270)=0
We add all the numbers together, and all the variables
X+(X+20)+(-3X+210)-270=0
We get rid of parentheses
X+X-3X+20+210-270=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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