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X=8(X+9)
We move all terms to the left:
X-(8(X+9))=0
We calculate terms in parentheses: -(8(X+9)), so:We get rid of parentheses
8(X+9)
We multiply parentheses
8X+72
Back to the equation:
-(8X+72)
X-8X-72=0
We add all the numbers together, and all the variables
-7X-72=0
We move all terms containing X to the left, all other terms to the right
-7X=72
X=72/-7
X=-10+2/7
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