$$7\frac{3}{4}\times2=$$
$\frac{31}{2}=15.5$
$$\frac{28+3}{4}\times 2$$
$$\frac{31}{4}\times 2$$
$$\frac{31\times 2}{4}$$
$$\frac{62}{4}$$
$$\frac{31}{2}$$
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$\frac{31}{2} = 15\frac{1}{2} = 15.5$
