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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
13/3 = 39/m // - 39/m
13/3-(39/m) = 0
13/3-39*m^-1 = 0
-39*m^-1 = -13/3 // : -39
m^-1 = 1/9
-1 < 0
1/(m^1) = 1/9 // * m^1
1 = 1/9*m^1 // : 1/9
9 = m^1
m = 9
m = 9
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