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X=210-2X=
We move all terms to the left:
X-(210-2X)=0
We add all the numbers together, and all the variables
X-(-2X+210)=0
We get rid of parentheses
X+2X-210=0
We add all the numbers together, and all the variables
3X-210=0
We move all terms containing X to the left, all other terms to the right
3X=210
X=210/3
X=70
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