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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 125 // - 125
(180*(n-2))/n-125 = 0
(180*(n-2))/n+(-125*n)/n = 0
180*(n-2)-125*n = 0
55*n-360 = 0
(55*n-360)/n = 0
(55*n-360)/n = 0 // * n
55*n-360 = 0
55*n-360 = 0 // + 360
55*n = 360 // : 55
n = 360/55
n = 72/11
n = 72/11
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