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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-14/m = 2/8 // - 2/8
-14/m-(2/8) = 0
-14/m-1/4 = 0
-14*m^-1 = 1/4 // : -14
m^-1 = -1/56
-1 < 0
1/(m^1) = -1/56 // * m^1
1 = -1/56*m^1 // : -1/56
-56 = m^1
m = -56
m = -56
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