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