$$3+\frac{25}{7}$$
$\frac{46}{7}\approx 6.571428571$
$$\frac{21}{7}+\frac{25}{7}$$
$$\frac{21+25}{7}$$
$$\frac{46}{7}$$
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$\frac{2 \cdot 23}{7} = 6\frac{4}{7} = 6.571428571428571$