Lindsay went to market with a basket of eggs.
She sold half of her eggs and half an egg to her first customer.
She sold half of the remainder and half an egg to her second customer.
She sold half of her remaining eggs and half an egg to her third customer.
At close of market, Lindsay had 9 eggs left.
How many did she have to start with?
(clue: the eggs were not hard-boiled!!)
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