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D( n )
n = 0
5*n = 0
n = 0
n = 0
5*n = 0
5*n = 0
5*n = 0 // : 5
n = 0
n in (-oo:0) U (0:+oo)
1/n = 1/(5*n)-((n-1)/(5*n)) // - 1/(5*n)-((n-1)/(5*n))
(n-1)/(5*n)+1/n-(1/(5*n)) = 0
(n-1)/(5*n)+1/n+(-1/5)*n^-1 = 0
(n-1)/(5*n)+1/n-1/(5*n) = 0
(n*(n-1))/(5*n*n)+(1*5*n)/(5*n*n)+(-1*n)/(5*n*n) = 0
n*(n-1)+1*5*n-1*n = 0
n^2+4*n-n = 0
n^2+3*n = 0
n^2+3*n = 0
n*(n+3) = 0
n+3 = 0 // - 3
n = -3
n*(n+3) = 0
(n*(n+3))/(5*n*n) = 0
(n*(n+3))/(5*n*n) = 0 // * 5*n*n
n*(n+3) = 0
( n+3 )
n+3 = 0 // - 3
n = -3
( n )
n = 0
n in { 0}
n = -3
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