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              	The figure below shows a quadrilateral ABCD with AC 
				perpendicular to BD, AE = DE, and BE = CE. FEG is perpendicular 
				to AB ( F on AB and G on BC extended), HDK is perpendicular to 
				AB (H on AB extended and K on BC extended). If BC = 7 and CG = 
				3, find BK.
 
 
				 
 
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