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