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n in (-oo:+oo)
(180*n-360)/2 = 60 // - 60
(180*n-360)/2-60 = 0
(180*n-360)/2+(-60*2)/2 = 0
180*n-60*2-360 = 0
180*n-480 = 0
(180*n-480)/2 = 0
(180*n-480)/2 = 0 // * 2
180*n-480 = 0
180*n-480 = 0 // + 480
180*n = 480 // : 180
n = 480/180
n = 8/3
n = 8/3
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