## Intermediate Algebra for College Students (7th Edition)

$M=\dfrac{P-C}{C}$
Subtract by $C$ to both sides: $P-C=C+MC-C \\P-C=MC$ Divide by $C$ on both sides: $\dfrac{P-C}{C}=\dfrac{MC}{C} \\\dfrac{P-C}{C}=M \\M=\dfrac{P-C}{C}$