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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
6/8 = 27/m // - 27/m
6/8-(27/m) = 0
6/8-27*m^-1 = 0
-27*m^-1 = -3/4 // : -27
m^-1 = 1/36
-1 < 0
1/(m^1) = 1/36 // * m^1
1 = 1/36*m^1 // : 1/36
36 = m^1
m = 36
m = 36
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