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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
27/2 = 81/m // - 81/m
27/2-(81/m) = 0
27/2-81*m^-1 = 0
-81*m^-1 = -27/2 // : -81
m^-1 = 1/6
-1 < 0
1/(m^1) = 1/6 // * m^1
1 = 1/6*m^1 // : 1/6
6 = m^1
m = 6
m = 6
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