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X=(2X+9)
We move all terms to the left:
X-((2X+9))=0
We calculate terms in parentheses: -((2X+9)), so:We get rid of parentheses
(2X+9)
We get rid of parentheses
2X+9
Back to the equation:
-(2X+9)
X-2X-9=0
We add all the numbers together, and all the variables
-1X-9=0
We move all terms containing X to the left, all other terms to the right
-X=9
X=9/-1
X=-9
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