When n liters of fuel was added to a tank that was already $$\frac1 3$$ full, the tank was filled to $$\frac7 9$$ of its capacity. In terms of n, what is the capacity of the tank, in liters?
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A$$\frac{10}{9}{n}$$
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B$$\frac{4}{3}{n}$$
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C$$\frac{3}{2}{n}$$
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D$$\frac{9}{4}{n}$$
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E$$\frac{7}{3}{n}$$