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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
360/n = 20 // - 20
360/n-20 = 0
360*n^-1 = 20 // : 360
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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