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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/3 = 5/m-3 // - 5/m-3
2/3-(5/m)+3 = 0
2/3-5*m^-1+3 = 0
-5*m^-1 = -11/3 // : -5
m^-1 = 11/15
-1 < 0
1/(m^1) = 11/15 // * m^1
1 = 11/15*m^1 // : 11/15
15/11 = m^1
m = 15/11
m = 15/11
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