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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 147 // - 147
(180*(n-2))/n-147 = 0
(180*(n-2))/n+(-147*n)/n = 0
180*(n-2)-147*n = 0
33*n-360 = 0
(33*n-360)/n = 0
(33*n-360)/n = 0 // * n
33*n-360 = 0
33*n-360 = 0 // + 360
33*n = 360 // : 33
n = 360/33
n = 120/11
n = 120/11
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