It seems like you're asking for a mathematical expression, but the notation is a bit unclear. If you're trying to perform the calculation for \(12 + \frac{9}{3}\), we can simplify it like this:
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Divide 9 by 3: \(\frac{9}{3} = 3\)
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Then add that result to 12: \(12 + 3 = 15\)
So, \(12 + \frac{9}{3} = 15\).
If you meant something else, please clarify!