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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
15/m = 8/5 // - 8/5
15/m-(8/5) = 0
15/m-8/5 = 0
15*m^-1 = 8/5 // : 15
m^-1 = 8/75
-1 < 0
1/(m^1) = 8/75 // * m^1
1 = 8/75*m^1 // : 8/75
75/8 = m^1
m = 75/8
m = 75/8
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