$$\frac{13.5}{3}-\frac{3}{3}$$
$3.5$
$$\frac{13.5}{3}-1$$
$$\frac{135}{30}-1$$
$$\frac{9}{2}-1$$
$$\frac{9}{2}-\frac{2}{2}$$
$$\frac{9-2}{2}$$
$$\frac{7}{2}$$
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$\frac{7}{2} = 3\frac{1}{2} = 3.5$