Solve for P
P=\frac{M-30}{2}
Solve for M
M=2\left(P+15\right)
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2P+30=M
Swap sides so that all variable terms are on the left hand side.
2P=M-30
Subtract 30 from both sides.
\frac{2P}{2}=\frac{M-30}{2}
Divide both sides by 2.
P=\frac{M-30}{2}
Dividing by 2 undoes the multiplication by 2.
P=\frac{M}{2}-15
Divide M-30 by 2.
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