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

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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The correct Answer is:
A
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