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X+50=2X-20=X-10
We move all terms to the left:
X+50-(2X-20)=0
We get rid of parentheses
X-2X+20+50=0
We add all the numbers together, and all the variables
-1X+70=0
We move all terms containing X to the left, all other terms to the right
-X=-70
X=-70/-1
X=+70
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