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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1.2/m = 3/5 // - 3/5
1.2/m-(3/5) = 0
1.2/m-3/5 = 0
1.2*m^-1 = 3/5 // : 1.2
m^-1 = 0.5
-1 < 0
1/(m^1) = 0.5 // * m^1
1 = 0.5*m^1 // : 0.5
2 = m^1
m = 2
m = 2
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