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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
14/m = 2/7 // - 2/7
14/m-(2/7) = 0
14/m-2/7 = 0
14*m^-1 = 2/7 // : 14
m^-1 = 1/49
-1 < 0
1/(m^1) = 1/49 // * m^1
1 = 1/49*m^1 // : 1/49
49 = m^1
m = 49
m = 49
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