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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 175 // - 175
(180*(n-2))/n-175 = 0
(180*(n-2))/n+(-175*n)/n = 0
180*(n-2)-175*n = 0
5*n-360 = 0
(5*n-360)/n = 0
(5*n-360)/n = 0 // * n
5*n-360 = 0
5*n-360 = 0 // + 360
5*n = 360 // : 5
n = 360/5
n = 72
n = 72
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