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D( n )
n+1 = 0
n+1 = 0
n+1 = 0
n+1 = 0 // - 1
n = -1
n in (-oo:-1) U (-1:+oo)
0.8 = n/(n+1) // - n/(n+1)
0.8-(n/(n+1)) = 0
(-1*n)/(n+1)+0.8 = 0
(-1*n)/(n+1)+(0.8*(n+1))/(n+1) = 0
0.8*(n+1)-1*n = 0
0.8-0.2*n = 0
(0.8-0.2*n)/(n+1) = 0
(0.8-0.2*n)/(n+1) = 0 // * n+1
0.8-0.2*n = 0
0.8-0.2*n = 0 // - 0.8
-0.2*n = -0.8 // : -0.2
n = -0.8/(-0.2)
n = 4
n = 4
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