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8. Armin bought a rare Wayne Gretzky rookie card for $18 in 2020. The function f(x)=18(9)^{\frac{5}{x+1}} \text { represents the increase of the value of the card in dollars over the } years, where x is the number of years. When the card reaches a value of $1125, he wants to sell it. What year will Armin sell the card? Only algebraic solutions will beассepted.[ 4]

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