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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 9 // - 9
(180*(n-2))/n-9 = 0
(180*(n-2))/n+(-9*n)/n = 0
180*(n-2)-9*n = 0
171*n-360 = 0
(171*n-360)/n = 0
(171*n-360)/n = 0 // * n
171*n-360 = 0
171*n-360 = 0 // + 360
171*n = 360 // : 171
n = 360/171
n = 40/19
n = 40/19
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