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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3030/m = 600 // - 600
3030/m-600 = 0
3030*m^-1 = 600 // : 3030
m^-1 = 20/101
-1 < 0
1/(m^1) = 20/101 // * m^1
1 = 20/101*m^1 // : 20/101
101/20 = m^1
m = 101/20
m = 101/20
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