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If the system of linear equations 2x ...

If the system of linear equations
`2x +y-z=7`
` x – 3y + 2z=1`
`x+4y+deltaz=k,` where `delta, k in R` has infinitely many solutions, then `delta +` k is equal to :

A

`-3`

B

3

C

6

D

9

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