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X=18-2(39-3X)
We move all terms to the left:
X-(18-2(39-3X))=0
We add all the numbers together, and all the variables
X-(18-2(-3X+39))=0
We calculate terms in parentheses: -(18-2(-3X+39)), so:We get rid of parentheses
18-2(-3X+39)
determiningTheFunctionDomain -2(-3X+39)+18
We multiply parentheses
6X-78+18
We add all the numbers together, and all the variables
6X-60
Back to the equation:
-(6X-60)
X-6X+60=0
We add all the numbers together, and all the variables
-5X+60=0
We move all terms containing X to the left, all other terms to the right
-5X=-60
X=-60/-5
X=+12
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