9/12=21/m

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Solution for 9/12=21/m equation: 


D( m )

m = 0

m = 0

m = 0

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

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

9/12-(21/m) = 0

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

-21*m^-1 = -3/4 // : -21

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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