Andy C. answered 09/04/17
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Math/Physics Tutor
Assuming it is a rectangle:
Perimeter = 2 * length + 2 * width
64 = 2 * (x+6) + 2 * 12
64 = 2 * (x+6) + 24
40 = 2 * (x + 6)
20 = x + 6
x=14
The length is 20.
The width is 12