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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
27/36 = 3/m // - 3/m
27/36-(3/m) = 0
27/36-3*m^-1 = 0
-3*m^-1 = -3/4 // : -3
m^-1 = 1/4
-1 < 0
1/(m^1) = 1/4 // * m^1
1 = 1/4*m^1 // : 1/4
4 = m^1
m = 4
m = 4
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