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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-6/m-3 = 1 // - 1
-6/m-3-1 = 0
-6*m^-1 = 4 // : -6
m^-1 = -2/3
-1 < 0
1/(m^1) = -2/3 // * m^1
1 = -2/3*m^1 // : -2/3
-3/2 = m^1
m = -3/2
m = -3/2
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