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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/6 = 18/m // - 18/m
4/6-(18/m) = 0
4/6-18*m^-1 = 0
-18*m^-1 = -2/3 // : -18
m^-1 = 1/27
-1 < 0
1/(m^1) = 1/27 // * m^1
1 = 1/27*m^1 // : 1/27
27 = m^1
m = 27
m = 27
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