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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m-(3/m) = 8 // - 8
5/m-(3/m)-8 = 0
5/m-3*m^-1-8 = 0
2*m^-1 = 8 // : 2
m^-1 = 4
-1 < 0
1/(m^1) = 4 // * m^1
1 = 4*m^1 // : 4
1/4 = m^1
m = 1/4
m = 1/4
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