M/-30=21

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Solution for M/-30=21 equation: 


M in (-oo:+oo)

M/(-30) = 21 // - 21

M/(-30)-21 = 0

-1/30*M-21 = 0 // + 21

-1/30*M = 21 // : -1/30

M = 21/(-1/30)

M = -630

M = -630

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