Solve for n
n=\frac{M-2p}{3}
Solve for M
M=3n+2p
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3n+2p=M
Swap sides so that all variable terms are on the left hand side.
3n=M-2p
Subtract 2p from both sides.
\frac{3n}{3}=\frac{M-2p}{3}
Divide both sides by 3.
n=\frac{M-2p}{3}
Dividing by 3 undoes the multiplication by 3.
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