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X-10=3X-42
We move all terms to the left:
X-10-(3X-42)=0
We get rid of parentheses
X-3X+42-10=0
We add all the numbers together, and all the variables
-2X+32=0
We move all terms containing X to the left, all other terms to the right
-2X=-32
X=-32/-2
X=+16
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