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X-30=3X-50
We move all terms to the left:
X-30-(3X-50)=0
We get rid of parentheses
X-3X+50-30=0
We add all the numbers together, and all the variables
-2X+20=0
We move all terms containing X to the left, all other terms to the right
-2X=-20
X=-20/-2
X=+10
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