$$\frac{6}{7}(\frac{9}{4}+\frac{3}{8})=$$
$\frac{9}{4}=2.25$
$$\frac{6}{7}\left(\frac{18}{8}+\frac{3}{8}\right)$$
$$\frac{6}{7}\times \frac{18+3}{8}$$
$$\frac{6}{7}\times \frac{21}{8}$$
$$\frac{6\times 21}{7\times 8}$$
$$\frac{126}{56}$$
$$\frac{9}{4}$$
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$\frac{3 ^ {2}}{2 ^ {2}} = 2\frac{1}{4} = 2.25$
