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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
24/27 = 4/m // - 4/m
24/27-(4/m) = 0
24/27-4*m^-1 = 0
-4*m^-1 = -8/9 // : -4
m^-1 = 2/9
-1 < 0
1/(m^1) = 2/9 // * m^1
1 = 2/9*m^1 // : 2/9
9/2 = m^1
m = 9/2
m = 9/2
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