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The solution of the system x+y-3z=-6 , -...

The solution of the system `x+y-3z=-6 , -7y + 7z=7, 3z=9` is ……………..

A

`x=1, y=2, z=3`

B

`x=-1, y=2, z=3`

C

`x=-1, y=-2, z=3`

D

`x=1, y=2, z=3`

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