6. Mr. Leone is building a fence in his backyard for his dog. The length is...

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6. Mr. Leone is building a fence in his backyard for his dog. The length is 5 less than 3 times a number and the width is 2 times a number. The area of the backyard is 56m². What is the number? [5] 6. Mr. Leone is building a fence in his backyard for his dog. The length is 5 less than 3 times a number and the width is 2 times a number. The area of the backyard is 56m². What is the number? [5]