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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2.6/m = 3.2/48 // - 3.2/48
2.6/m-(3.2/48) = 0
2.6/m-0.06666667 = 0
2.6*m^-1 = 0.06666667 // : 2.6
m^-1 = 0.02564103
-1 < 0
1/(m^1) = 0.02564103 // * m^1
1 = 0.02564103*m^1 // : 0.02564103
38.99999337 = m^1
m = 38.99999337
m = 38.99999337
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