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if veca=hati+hatj+hatk,vecb=2hati+xhatj+...

if `veca=hati+hatj+hatk,vecb=2hati+xhatj+hatk,vecc=hati-hatj+4hatk and veca*(vecbxxvecc)=70`, then x=

A

5

B

7

C

26

D

10

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