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}