m/-9=21

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Solution for m/-9=21 equation: 


m in (-oo:+oo)

m/(-9) = 21 // - 21

m/(-9)-21 = 0

-1/9*m-21 = 0 // + 21

-1/9*m = 21 // : -1/9

m = 21/(-1/9)

m = -189

m = -189

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