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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 5/15 // - 5/15
3/m-(5/15) = 0
3/m-1/3 = 0
3*m^-1 = 1/3 // : 3
m^-1 = 1/9
-1 < 0
1/(m^1) = 1/9 // * m^1
1 = 1/9*m^1 // : 1/9
9 = m^1
m = 9
m = 9
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