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X=-(X-9)
We move all terms to the left:
X-(-(X-9))=0
We calculate terms in parentheses: -(-(X-9)), so:We get rid of parentheses
-(X-9)
We get rid of parentheses
-X+9
We add all the numbers together, and all the variables
-1X+9
Back to the equation:
-(-1X+9)
X+1X-9=0
We add all the numbers together, and all the variables
2X-9=0
We move all terms containing X to the left, all other terms to the right
2X=9
X=9/2
X=4+1/2
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