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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/4 = -6/m // + -6/m
3/4-(-6/m) = 0
6*m^-1+3/4 = 0
6*m^-1 = -3/4 // : 6
m^-1 = -1/8
-1 < 0
1/(m^1) = -1/8 // * m^1
1 = -1/8*m^1 // : -1/8
-8 = m^1
m = -8
m = -8
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