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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-2/9 = 4/m // - 4/m
-(4/m)-2/9 = 0
-4*m^-1-2/9 = 0
-4*m^-1 = 2/9 // : -4
m^-1 = -1/18
-1 < 0
1/(m^1) = -1/18 // * m^1
1 = -1/18*m^1 // : -1/18
-18 = m^1
m = -18
m = -18
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