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X+20+2X-70+X+20+X+X=630
We move all terms to the left:
X+20+2X-70+X+20+X+X-(630)=0
We add all the numbers together, and all the variables
6X-660=0
We move all terms containing X to the left, all other terms to the right
6X=660
X=660/6
X=110
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