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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
132/m = 30/15 // - 30/15
132/m-(30/15) = 0
132/m-2 = 0
132*m^-1 = 2 // : 132
m^-1 = 1/66
-1 < 0
1/(m^1) = 1/66 // * m^1
1 = 1/66*m^1 // : 1/66
66 = m^1
m = 66
m = 66
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