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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
0.125 = 16/m // - 16/m
0.125-(16/m) = 0
0.125-16*m^-1 = 0
-16*m^-1 = -0.125 // : -16
m^-1 = 0.0078125
-1 < 0
1/(m^1) = 0.0078125 // * m^1
1 = 0.0078125*m^1 // : 0.0078125
128 = m^1
m = 128
m = 128
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