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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 15*(360/n) // - 15*(360/n)
(180*(n-2))/n-(15*(360/n)) = 0
(180*(n-2))/n-5400*n^-1 = 0
(180*(n-2))/n-5400/n = 0
180*(n-2)-5400 = 0
180*n-5760 = 0
(180*n-5760)/n = 0
(180*n-5760)/n = 0 // * n
180*n-5760 = 0
180*n-5760 = 0 // + 5760
180*n = 5760 // : 180
n = 5760/180
n = 32
n = 32
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