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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
23 = 35/m // - 35/m
23-(35/m) = 0
23-35*m^-1 = 0
-35*m^-1 = -23 // : -35
m^-1 = 23/35
-1 < 0
1/(m^1) = 23/35 // * m^1
1 = 23/35*m^1 // : 23/35
35/23 = m^1
m = 35/23
m = 35/23
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