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