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D( n )
n-6 = 0
n-6 = 0
n-6 = 0
n-6 = 0 // + 6
n = 6
n in (-oo:6) U (6:+oo)
10/4 = 2/(n-6) // - 2/(n-6)
10/4-(2/(n-6)) = 0
10/4-2*(n-6)^-1 = 0
5/2-2/(n-6) = 0
(-2*2)/(2*(n-6))+(5*(n-6))/(2*(n-6)) = 0
5*(n-6)-2*2 = 0
5*n-34 = 0
(5*n-34)/(2*(n-6)) = 0
(5*n-34)/(2*(n-6)) = 0 // * 2*(n-6)
5*n-34 = 0
5*n-34 = 0 // + 34
5*n = 34 // : 5
n = 34/5
n = 34/5
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