EOC Review Algebra 1 Goal 1: find age, given formula, values

Suppose that the value, V, of a used machine can be calculated by using the formula V=P(1-n/20), where P represents the price of a new machine and n represents the machine's age in years. A company purchased a new machine for $15,000. The value of the machine is now $12,375. How old is the machine?

Re: EOC Review Algebra 1 Goal 1

15000*(1-n/20) = 12375

Solve for n.