9-3m=-21

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Solution for 9-3m=-21 equation: 


m in (-oo:+oo)

9-(3*m) = -21 // + 21

9-(3*m)+21 = 0

9-3*m+21 = 0

30-3*m = 0 // - 30

-3*m = -30 // : -3

m = -30/(-3)

m = 10

m = 10

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