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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
34/m = 490/16 // - 490/16
34/m-(490/16) = 0
34/m-245/8 = 0
34*m^-1 = 245/8 // : 34
m^-1 = 245/272
-1 < 0
1/(m^1) = 245/272 // * m^1
1 = 245/272*m^1 // : 245/272
272/245 = m^1
m = 272/245
m = 272/245
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