Solve the differential equation 
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Definitions:
Excise Tax
An excise tax is a tax imposed on the sale of specific goods and services, such as tobacco, alcohol, and gasoline, often levied at the time of purchase.
Demand Curves
Graphical representations showing the relationship between the price of a good and the quantity demanded.
Supply Curves
Supply curves graphically represent the relationship between the price of a good or service and the quantity of it that suppliers are willing to produce and sell.
Equilibrium Quantity
The quantity at which the intentions of buyers and sellers in a particular market match at a particular price such that the quantity demanded and the quantity supplied are equal; the profit-maximizing output of a firm.
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