$$\frac{ 7 }{ 3 } \times ( { \left( \frac{ 7 }{ 3 } \right) }^{ 2 } +1$$
$\frac{406}{27}\approx 15.037037037$
$$\frac{7}{3}\left(\frac{49}{9}+1\right)$$
$$\frac{7}{3}\left(\frac{49}{9}+\frac{9}{9}\right)$$
$$\frac{7}{3}\times \frac{49+9}{9}$$
$$\frac{7}{3}\times \frac{58}{9}$$
$$\frac{7\times 58}{3\times 9}$$
$$\frac{406}{27}$$
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$\frac{2 \cdot 7 \cdot 29}{3 ^ {3}} = 15\frac{1}{27} = 15.037037037037036$
