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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m/m-10-9 = 9/m-9 // - 9/m-9
m/m-(9/m)-10-9+9 = 0
m/m-9*m^-1-10-9+9 = 0
-9*m^-1 = 9 // : -9
m^-1 = -1
-1 < 0
1/(m^1) = -1 // * m^1
1 = -1*m^1 // : -1
-1 = m^1
m = -1
m = -1
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