Solve the equation. 
Definitions:
Centered Moving Averages
A method applied in analyzing time series to minimize short-term variations and emphasize longer-term trends or cycles.
Weekly iPhones Sales
The quantity of iPhones sold in a single week, a specific measure of sales performance.
Apple Store
A retail and online store operated by Apple Inc., selling Apple products and services.
Centered Moving Average
A method used in time series analysis to smooth out short-term fluctuations and highlight longer-term trends or cycles.
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