-21=n/3

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Solution for -21=n/3 equation: 


n in (-oo:+oo)

-21 = n/3 // - n/3

-(n/3)-21 = 0

-1/3*n-21 = 0 // + 21

-1/3*n = 21 // : -1/3

n = 21/(-1/3)

n = -63

n = -63

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