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The price of an item is initially $900. For the first 4 years the price increases by $35 each year. For the next 3 years the price decreases by $25 per year. From then on the price increases by $35 per year. Find a piecewise-defined function P that specifies the price of the item after t years have passed. Let P(t) = the price of the item in dollars after t years have passed.

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