21/2=84/m

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Solution for 21/2=84/m equation: 


D( m )

m = 0

m = 0

m = 0

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

21/2 = 84/m // - 84/m

21/2-(84/m) = 0

21/2-84*m^-1 = 0

-84*m^-1 = -21/2 // : -84

m^-1 = 1/8

-1 < 0

1/(m^1) = 1/8 // * m^1

1 = 1/8*m^1 // : 1/8

8 = m^1

m = 8

m = 8

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