$$1\frac{3}{4}\times2=$$
$\frac{7}{2}=3.5$
$$\frac{4+3}{4}\times 2$$
$$\frac{7}{4}\times 2$$
$$\frac{7\times 2}{4}$$
$$\frac{14}{4}$$
$$\frac{7}{2}$$
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$\frac{7}{2} = 3\frac{1}{2} = 3.5$