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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
30/m = 6 // - 6
30/m-6 = 0
30*m^-1 = 6 // : 30
m^-1 = 1/5
-1 < 0
1/(m^1) = 1/5 // * m^1
1 = 1/5*m^1 // : 1/5
5 = m^1
m = 5
m = 5
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