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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = -9 // + 9
3/m+9 = 0
3*m^-1 = -9 // : 3
m^-1 = -3
-1 < 0
1/(m^1) = -3 // * m^1
1 = -3*m^1 // : -3
-1/3 = m^1
m = -1/3
m = -1/3
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