$$\frac{7}{2}\times\frac{8}{7}+\frac{15}{7}\times\frac{4}{3}$$
$\frac{48}{7}\approx 6.857142857$
$$\frac{7\times 8}{2\times 7}+\frac{15}{7}\times \frac{4}{3}$$
$$\frac{8}{2}+\frac{15}{7}\times \frac{4}{3}$$
$$4+\frac{15}{7}\times \frac{4}{3}$$
$$4+\frac{15\times 4}{7\times 3}$$
$$4+\frac{60}{21}$$
$$4+\frac{20}{7}$$
$$\frac{28}{7}+\frac{20}{7}$$
$$\frac{28+20}{7}$$
$$\frac{48}{7}$$
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$\frac{2 ^ {4} \cdot 3}{7} = 6\frac{6}{7} = 6.857142857142857$
