$$4(\frac{1}{4})-1(\frac{3}{2})$$
$-\frac{1}{2}=-0.5$
$$1-1\times \frac{3}{2}$$
$$1-\frac{3}{2}$$
$$\frac{2}{2}-\frac{3}{2}$$
$$\frac{2-3}{2}$$
$$-\frac{1}{2}$$
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$-\frac{1}{2} = -0.5$