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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m-4 = 3/8 // - 3/8
5/m-(3/8)-4 = 0
5/m-3/8-4 = 0
5*m^-1 = 35/8 // : 5
m^-1 = 7/8
-1 < 0
1/(m^1) = 7/8 // * m^1
1 = 7/8*m^1 // : 7/8
8/7 = m^1
m = 8/7
m = 8/7
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