Solve for n
n=\frac{s-5w}{5}
Solve for s
s=5\left(n+w\right)
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5n+5w=s
Swap sides so that all variable terms are on the left hand side.
5n=s-5w
Subtract 5w from both sides.
\frac{5n}{5}=\frac{s-5w}{5}
Divide both sides by 5.
n=\frac{s-5w}{5}
Dividing by 5 undoes the multiplication by 5.
n=\frac{s}{5}-w
Divide s-5w by 5.
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