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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m+(9*m)/m+1+1 = 0
9*m^-1 = -11 // : 9
m^-1 = -11/9
-1 < 0
1/(m^1) = -11/9 // * m^1
1 = -11/9*m^1 // : -11/9
-9/11 = m^1
m = -9/11
m = -9/11
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