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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
100/m = 11/2 // - 11/2
100/m-(11/2) = 0
100/m-11/2 = 0
100*m^-1 = 11/2 // : 100
m^-1 = 11/200
-1 < 0
1/(m^1) = 11/200 // * m^1
1 = 11/200*m^1 // : 11/200
200/11 = m^1
m = 200/11
m = 200/11
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