-21=m/3

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Solution for -21=m/3 equation: 


m in (-oo:+oo)

-21 = m/3 // - m/3

-(m/3)-21 = 0

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

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

m = 21/(-1/3)

m = -63

m = -63

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