Solve for n
n=\frac{m-3}{3}
Solve for m
m=3\left(n+1\right)
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3n+3=m
Swap sides so that all variable terms are on the left hand side.
3n=m-3
Subtract 3 from both sides.
\frac{3n}{3}=\frac{m-3}{3}
Divide both sides by 3.
n=\frac{m-3}{3}
Dividing by 3 undoes the multiplication by 3.
n=\frac{m}{3}-1
Divide m-3 by 3.
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