Write the following third-order equation as a system of equations. 
Definitions:
Expected Price Level
The future value that consumers and businesses anticipate for the average price of goods and services in the economy.
Actual Price Level
The current general price of goods and services in the economy, not adjusted for inflation.
Short-Run Aggregate Supply
The overall quantity of products and services that companies intend to offer for sale within a brief period, based on existing prices.
Aggregate Demand
Overall market demand for goods and services in an economy, determined at a prevailing comprehensive price level for a certain duration.
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