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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
53 = (40*n+260)/n // - (40*n+260)/n
53-((40*n+260)/n) = 0
(-1*(40*n+260))/n+53 = 0
(-1*(40*n+260))/n+(53*n)/n = 0
53*n-1*(40*n+260) = 0
13*n-260 = 0
(13*n-260)/n = 0
(13*n-260)/n = 0 // * n
13*n-260 = 0
13*n-260 = 0 // + 260
13*n = 260 // : 13
n = 260/13
n = 20
n = 20
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