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X=9X-7
We move all terms to the left:
X-(9X-7)=0
We get rid of parentheses
X-9X+7=0
We add all the numbers together, and all the variables
-8X+7=0
We move all terms containing X to the left, all other terms to the right
-8X=-7
X=-7/-8
X=7/8
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