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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7.2/m = 2.4/1.8 // - 2.4/1.8
7.2/m-(2.4/1.8) = 0
7.2/m-1.33333333 = 0
7.2*m^-1 = 1.33333333 // : 7.2
m^-1 = 0.18518518
-1 < 0
1/(m^1) = 0.18518518 // * m^1
1 = 0.18518518*m^1 // : 0.18518518
5.40000015 = m^1
m = 5.40000015
m = 5.40000015
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