Im not sure but it think its 410 mile long, idk double check by changing it into eighths
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The whole number multiply by the denominator and add to the numerator.
Here, Just apply Distributive property which tells, a(b + c) = ab + bc
So, -6(-7 - 3k) = 42 + 18k
In short, Your Answer would be 42 +18k
Hope this helps!