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X+30=2X+10=4X+30
We move all terms to the left:
X+30-(2X+10)=0
We get rid of parentheses
X-2X-10+30=0
We add all the numbers together, and all the variables
-1X+20=0
We move all terms containing X to the left, all other terms to the right
-X=-20
X=-20/-1
X=+20
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