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-39=-2x+7(x+3)
We move all terms to the left:
-39-(-2x+7(x+3))=0
We calculate terms in parentheses: -(-2x+7(x+3)), so:We get rid of parentheses
-2x+7(x+3)
We multiply parentheses
-2x+7x+21
We add all the numbers together, and all the variables
5x+21
Back to the equation:
-(5x+21)
-5x-21-39=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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