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2x=(x-9)
We move all terms to the left:
2x-((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
Back to the equation:
-(x-9)
2x-x+9=0
We add all the numbers together, and all the variables
x+9=0
We move all terms containing x to the left, all other terms to the right
x=-9
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