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39-4n=-3(n+7)
We move all terms to the left:
39-4n-(-3(n+7))=0
We calculate terms in parentheses: -(-3(n+7)), so:We get rid of parentheses
-3(n+7)
We multiply parentheses
-3n-21
Back to the equation:
-(-3n-21)
-4n+3n+21+39=0
We add all the numbers together, and all the variables
-1n+60=0
We move all terms containing n to the left, all other terms to the right
-n=-60
n=-60/-1
n=+60
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