Solve for n
n=\frac{m+21}{5}
Solve for m
m=5n-21
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5n-21=m
Swap sides so that all variable terms are on the left hand side.
5n=m+21
Add 21 to both sides.
\frac{5n}{5}=\frac{m+21}{5}
Divide both sides by 5.
n=\frac{m+21}{5}
Dividing by 5 undoes the multiplication by 5.
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