please solve this ...
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A= 3.5
B= 4.5
C= 9.5
D= 3.5
A+ B = 3.5 + 4.5 = 8
C- D = 9.5 - 3.5 = 6
A+C = 3.5 + 9.5 = 13
B+ D = 3.5 + 4.5 = 8.
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