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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
15/m = 10/12 // - 10/12
15/m-(10/12) = 0
15/m-5/6 = 0
15*m^-1 = 5/6 // : 15
m^-1 = 1/18
-1 < 0
1/(m^1) = 1/18 // * m^1
1 = 1/18*m^1 // : 1/18
18 = m^1
m = 18
m = 18
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