Solve for n
n=-\frac{id}{10}
Solve for d
d=10in
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10in=d
Swap sides so that all variable terms are on the left hand side.
\frac{10in}{10i}=\frac{d}{10i}
Divide both sides by 10i.
n=\frac{d}{10i}
Dividing by 10i undoes the multiplication by 10i.
n=-\frac{id}{10}
Divide d by 10i.
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