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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(6/1)/5 = (1/4)/m // - (1/4)/m
(6/1)/5-((1/4)/m) = 0
(-1/4)*m^-1+6/5 = 0
-1/4*m^-1 = -6/5 // : -1/4
m^-1 = 24/5
-1 < 0
1/(m^1) = 24/5 // * m^1
1 = 24/5*m^1 // : 24/5
5/24 = m^1
m = 5/24
m = 5/24
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