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Let a, b, and c be three real numbers sa...

Let a, b, and c be three real numbers satisfying
`[(a,b,c)][[1,9,7],[8,2,7],[7,3,7]]=[(0,0,0)]" "...(E)`
If the point `P(a,b,c),` with reference to €, lies on
the plane `2x+y+z=1,` then the value of `7 a + b + c`
is

A

0

B

12

C

7

D

6

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