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