If vec a and vec b are vectors such tha...

If `vec a and vec b` are vectors such that `|vec a+vecb| = sqrt 29 and vec a xx (2hat i + 3hat j+4hat k) = (2hat i +3hat j + 4hat k)xx vec b` , then a possible value of `(vec a+vec b).(-7hat i +2hat j + 3hat k)` is

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