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