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