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-3n+9=-4(6n+3)
We move all terms to the left:
-3n+9-(-4(6n+3))=0
We calculate terms in parentheses: -(-4(6n+3)), so:We get rid of parentheses
-4(6n+3)
We multiply parentheses
-24n-12
Back to the equation:
-(-24n-12)
-3n+24n+12+9=0
We add all the numbers together, and all the variables
21n+21=0
We move all terms containing n to the left, all other terms to the right
21n=-21
n=-21/21
n=-1
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