(X-2)*180/X:(2X-1*)180/2X=3:4
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(X-2)*180/X:(2X-1*)180/2X=3:4(X-2)*180/X:(2X-1*)180/2X=3:4(X-2)*180/X:(2X-1*)180/2X=3:4(X-2)180/X:(2
(X-2)*180/X:(2X-1*)180/2X=3:4
(X-2)*180/X:(2X-1*)180/2X=3:4
(X-2)*180/X:(2X-1*)180/2X=3:4
(X-2)180/X:(2X-1)*180/2X=3:4
(X-2):(2X-1)/2=3:4
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