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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/12 = -24/m // + -24/m
3/12-(-24/m) = 0
24*m^-1+3/12 = 0
24*m^-1 = -1/4 // : 24
m^-1 = -1/96
-1 < 0
1/(m^1) = -1/96 // * m^1
1 = -1/96*m^1 // : -1/96
-96 = m^1
m = -96
m = -96
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