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D( n )
n-10 = 0
n-10 = 0
n-10 = 0
n-10 = 0 // + 10
n = 10
n in (-oo:10) U (10:+oo)
8/(n-10) = 64 // - 64
8/(n-10)-64 = 0
8/(n-10)+(-64*(n-10))/(n-10) = 0
8-64*(n-10) = 0
648-64*n = 0
(648-64*n)/(n-10) = 0
(648-64*n)/(n-10) = 0 // * n-10
648-64*n = 0
648-64*n = 0 // - 648
-64*n = -648 // : -64
n = -648/(-64)
n = 81/8
n = 81/8
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