A construction company has adjoined a 4900 ft22 rectangular enclosure to its office building. Three sides of the enclosure are fenced in. The side of the building adjacent to the enclosure is 490 ft long and a portion of this side is used as the fourth side of the enclosure. Let ?x and ?y be the dimensions of the enclosure, where ?x is measured parallel to the building, and let ?L be the length of fencing required for those dimensions.

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