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X+12=2(X+3)
We move all terms to the left:
X+12-(2(X+3))=0
We calculate terms in parentheses: -(2(X+3)), so:We get rid of parentheses
2(X+3)
We multiply parentheses
2X+6
Back to the equation:
-(2X+6)
X-2X-6+12=0
We add all the numbers together, and all the variables
-1X+6=0
We move all terms containing X to the left, all other terms to the right
-X=-6
X=-6/-1
X=+6
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