Dinesh, Prateek and Ankush go for a party in a restaurant. Dinesh has four times as many coins as Prateek and 9 more than Ankush. When Dinesh gives away 50% of his coins, Prateek and Ankush agree to split those coins up equally. Now, Ankush has twice as many coins as Prateek. How many coins did Prateek start with?
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