$$-3(15-3/5)$$
$-\frac{216}{5}=-43.2$
$$-3\left(\frac{75}{5}-\frac{3}{5}\right)$$
$$-3\times \frac{75-3}{5}$$
$$-3\times \frac{72}{5}$$
$$\frac{-3\times 72}{5}$$
$$\frac{-216}{5}$$
$$-\frac{216}{5}$$
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$-\frac{216}{5} = -43\frac{1}{5} = -43.2$
