9/21=12/m

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Solution for 9/21=12/m equation: 


D( m )

m = 0

m = 0

m = 0

m in (-oo:0) U (0:+oo)

9/21 = 12/m // - 12/m

9/21-(12/m) = 0

9/21-12*m^-1 = 0

-12*m^-1 = -3/7 // : -12

m^-1 = 1/28

-1 < 0

1/(m^1) = 1/28 // * m^1

1 = 1/28*m^1 // : 1/28

28 = m^1

m = 28

m = 28

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