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X+50=3X+40
We move all terms to the left:
X+50-(3X+40)=0
We get rid of parentheses
X-3X-40+50=0
We add all the numbers together, and all the variables
-2X+10=0
We move all terms containing X to the left, all other terms to the right
-2X=-10
X=-10/-2
X=+5
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