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bar(a) and bar(b) are vectors such that ...

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

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