Perimeter = 2 times the width + 2 times the length
= 2(w + 7) + 2w where w = width
2(w + 7) + 2w = 66
4w + 14 = 66
4w = 66-14 = 52
w = 52/4 = 13
length = 13 + 7 = 20
width = 13 and length = 20
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