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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 108 // - 108
(180*(n-2))/n-108 = 0
(180*(n-2))/n+(-108*n)/n = 0
180*(n-2)-108*n = 0
72*n-360 = 0
(72*n-360)/n = 0
(72*n-360)/n = 0 // * n
72*n-360 = 0
72*n-360 = 0 // + 360
72*n = 360 // : 72
n = 360/72
n = 5
n = 5
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