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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
360/n-60 = (180*(n-2))/n // - (180*(n-2))/n
360/n-((180*(n-2))/n)-60 = 0
360/n-180*n^-1*(n-2)-60 = 0
(-180*n^-1*n*(n-2))/n+360/n+(-60*n)/n = 0
360-180*n^-1*n*(n-2)-60*n = 0
720-180*n-60*n = 0
720-240*n = 0
(720-240*n)/n = 0
(720-240*n)/n = 0 // * n
720-240*n = 0
720-240*n = 0 // - 720
-240*n = -720 // : -240
n = -720/(-240)
n = 3
n = 3
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