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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
8/4 = 11/m // - 11/m
8/4-(11/m) = 0
8/4-11*m^-1 = 0
-11*m^-1 = -2 // : -11
m^-1 = 2/11
-1 < 0
1/(m^1) = 2/11 // * m^1
1 = 2/11*m^1 // : 2/11
11/2 = m^1
m = 11/2
m = 11/2
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