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