length of patio is 12 ft greater than the width, if the perimeter is 84 ft, then what is the length and width.

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I'm assuming that the patio is a rectangle.If the width is x feet, then the length is x + 12.The perimeter is (x) + (x + 12) + (x) + (x + 12)84 = 4x + 24Solve for x to find the width. Add 12 to get the length.