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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
13/m = 2/9 // - 2/9
13/m-(2/9) = 0
13/m-2/9 = 0
13*m^-1 = 2/9 // : 13
m^-1 = 2/117
-1 < 0
1/(m^1) = 2/117 // * m^1
1 = 2/117*m^1 // : 2/117
117/2 = m^1
m = 117/2
m = 117/2
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