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Verified Answer :

luana

\(40=-\frac{5n}{8}\ \ \ |Multiply\ by\ 8\ \ \ both\ sides\\\\ 320=-5n\ \ \ |Divide\ by\ (-5)\\\\ n=-64\\\\Solution\ is\ -64.\)

To find value of n, we have to have only one n of the RHS.
To do this, we can multiply both sides by 8
\(40= \frac{-5n}{8}\) /*8
\(320=-5n\)
Now we can divide both sides by -5
\(320=-5n\)  / :(-5)
\(-64=n\)

Result is -64

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