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Let P be the plane passing through the line `(x-1)/1=(y-2)/-3=(z+5)/7` and the point `(2,4,-3)`. If the image of the point `(-1,3,4)` in the plane P is `(alpha,beta,gamma)` then `alpha+beta+gamma` is equal to

A

9

B

10

C

11

D

12

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