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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(2/3)*m+1/3 = (2/3)*m-(2/m) // - (2/3)*m-(2/m)
(2/3)*m-((2/3)*m)+2/m+1/3 = 0
(2/3)*m+(-2/3)*m+2/m+1/3 = 0
2*m^-1 = -1/3 // : 2
m^-1 = -1/6
-1 < 0
1/(m^1) = -1/6 // * m^1
1 = -1/6*m^1 // : -1/6
-6 = m^1
m = -6
m = -6
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