$$5\frac{3}{4}-\frac{1}{2}$$
$\frac{21}{4}=5.25$
$$\frac{20+3}{4}-\frac{1}{2}$$
$$\frac{23}{4}-\frac{1}{2}$$
$$\frac{23}{4}-\frac{2}{4}$$
$$\frac{23-2}{4}$$
$$\frac{21}{4}$$
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$\frac{3 \cdot 7}{2 ^ {2}} = 5\frac{1}{4} = 5.25$
