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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 150 // - 150
(180*(n-2))/n-150 = 0
(180*(n-2))/n+(-150*n)/n = 0
180*(n-2)-150*n = 0
30*n-360 = 0
(30*n-360)/n = 0
(30*n-360)/n = 0 // * n
30*n-360 = 0
30*n-360 = 0 // + 360
30*n = 360 // : 30
n = 360/30
n = 12
n = 12
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