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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m = 6/10 // - 6/10
9/m-(6/10) = 0
9/m-3/5 = 0
9*m^-1 = 3/5 // : 9
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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