David has d books, which is 3 times as many as Jeff and $$\frac{1}{2}$$ as many as Paula. How many books do the three of them have altogether, in terms of d
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A$$\frac{5}{6}{d}$$
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B$$\frac{7}{3}{d}$$
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C$$\frac{10}{3}{d}$$
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D$$\frac{7}{2}{d}$$
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E$$\frac{9}{2}{d}$$