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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18.75/m = 3 // - 3
18.75/m-3 = 0
18.75*m^-1 = 3 // : 18.75
m^-1 = 0.16
-1 < 0
1/(m^1) = 0.16 // * m^1
1 = 0.16*m^1 // : 0.16
6.25 = m^1
m = 6.25
m = 6.25
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