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X+3=2(X-9)
We move all terms to the left:
X+3-(2(X-9))=0
We calculate terms in parentheses: -(2(X-9)), so:We get rid of parentheses
2(X-9)
We multiply parentheses
2X-18
Back to the equation:
-(2X-18)
X-2X+18+3=0
We add all the numbers together, and all the variables
-1X+21=0
We move all terms containing X to the left, all other terms to the right
-X=-21
X=-21/-1
X=+21
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