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If the sum the matrices [{:(x),(x),(y):}...

If the sum the matrices `[{:(x),(x),(y):}][{:(y),(y),(z):}] and [{:(z),(0),(0):}]` is the matrix `[{:(10),(5),(5):}]` then what is the value of y ?

A

`-5`

B

0

C

5

D

10

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