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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-2/m-4 = 6 // - 6
-2/m-6-4 = 0
-2*m^-1 = 10 // : -2
m^-1 = -5
-1 < 0
1/(m^1) = -5 // * m^1
1 = -5*m^1 // : -5
-1/5 = m^1
m = -1/5
m = -1/5
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