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If 2 x + 3y - 5 z = 18 , 3 x + 2y + z =...

If ` 2 x + 3y - 5 z = 18 , 3 x + 2y + z = 29 and x + y + 3z = 17` then what is the value of ` xy + yz + zx` ?

A

32

B

52

C

64

D

46

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