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