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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/6 = 5/m // - 5/m
2/6-(5/m) = 0
2/6-5*m^-1 = 0
-5*m^-1 = -1/3 // : -5
m^-1 = 1/15
-1 < 0
1/(m^1) = 1/15 // * m^1
1 = 1/15*m^1 // : 1/15
15 = m^1
m = 15
m = 15
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