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17 A tank contains 729 liters of pure acid (The tank's capacity is 729 liters 13\( x \) liters of acid were withdrawn and replaced by water. After thoroughly mixing the two liquids. 3\( x \) liters of the solution is withdrawn. This procedure is repeatedly performed six times in all. The tank is then found to have 64 liters of acid (and the rest water). Find

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