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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-8/m = 2/3 // - 2/3
-8/m-(2/3) = 0
-8/m-2/3 = 0
-8*m^-1 = 2/3 // : -8
m^-1 = -1/12
-1 < 0
1/(m^1) = -1/12 // * m^1
1 = -1/12*m^1 // : -1/12
-12 = m^1
m = -12
m = -12
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