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The perimeter of a rectangle equals the sum of the lengths of its four sides. If the width of a rectangle is 3 inches and its perimeter is 42 inches, find the length of the rectangle

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P = 2L + 2W

42 = 2L + 2(3)

42 = 2L + 6

42 - 6 = 2L

36 = 2L

18 = L

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