There are five standard weights A, B, C, D and E. Given the weight A and the weight B weigh 7 pounds in
total, the weight B and weight C weigh 9 pounds in total, the weight C and weight D weigh 11 pounds in
total, the weight D and weight E weigh 8 pounds in total, and the weight A, C and E weigh 10 pounds in
total. How many pounds does weight E weigh?
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