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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
10/30 = 27/m // - 27/m
10/30-(27/m) = 0
10/30-27*m^-1 = 0
-27*m^-1 = -1/3 // : -27
m^-1 = 1/81
-1 < 0
1/(m^1) = 1/81 // * m^1
1 = 1/81*m^1 // : 1/81
81 = m^1
m = 81
m = 81
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