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