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If bar(a) and bar(b) are vectors such th...

If `bar(a)` and `bar(b)` are vectors such that `|bar(a)+bar(b)|=sqrt(29)` and `bar(a)times(2hat i+3hat j+4hat k)=(2hat i+3hat j+4hat k)timesbar(b)` then the value of `(bar(a)+bar(b)).(-7hat i+2hat j+3hat k)` is .......

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