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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m = 15/9 // - 15/9
5/m-(15/9) = 0
5/m-5/3 = 0
5*m^-1 = 5/3 // : 5
m^-1 = 1/3
-1 < 0
1/(m^1) = 1/3 // * m^1
1 = 1/3*m^1 // : 1/3
3 = m^1
m = 3
m = 3
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