$$5/1/2+21/4-33/4$$
$-\frac{1}{2}=-0.5$
$$\frac{5}{2}+\frac{21}{4}-\frac{33}{4}$$
$$\frac{10}{4}+\frac{21}{4}-\frac{33}{4}$$
$$\frac{10+21}{4}-\frac{33}{4}$$
$$\frac{31}{4}-\frac{33}{4}$$
$$\frac{31-33}{4}$$
$$\frac{-2}{4}$$
$$-\frac{1}{2}$$
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$-\frac{1}{2} = -0.5$