Erica sees 9 butterflies in the garden. She sees one-third of them fly away. How many butterflies are left in the garden? Let's be accurate as possible.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Erica sees 9 / 3 = 3 butterflies fly away. There are 9 - 3 = 6 butterflies still left in the garden.
The answer: 6.