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x in (-oo:+oo)
63/60 = x/180 // - x/180
63/60-(x/180) = 0
21/20-1/180*x = 0 // - 21/20
-1/180*x = -21/20 // : -1/180
x = -21/20/(-1/180)
x = 189
x = 189
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