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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
16/27 = 4/m // - 4/m
16/27-(4/m) = 0
16/27-4*m^-1 = 0
-4*m^-1 = -16/27 // : -4
m^-1 = 4/27
-1 < 0
1/(m^1) = 4/27 // * m^1
1 = 4/27*m^1 // : 4/27
27/4 = m^1
m = 27/4
m = 27/4
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