-9-6n+3n=-21

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Solution for -9-6n+3n=-21 equation: 


n in (-oo:+oo)

3*n-(6*n)-9 = -21 // + 21

3*n-(6*n)-9+21 = 0

3*n-6*n-9+21 = 0

12-3*n = 0 // - 12

-3*n = -12 // : -3

n = -12/(-3)

n = 4

n = 4

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