$$(15-8 \times 3) \times 18/6-60/(4 \times 5-7 \times 5)+102/(-1-2)$$
$-57$
$$\frac{\left(15-24\right)\times 18}{6}-\frac{60}{4\times 5-7\times 5}+\frac{102}{-1-2}$$
$$\frac{-9\times 18}{6}-\frac{60}{4\times 5-7\times 5}+\frac{102}{-1-2}$$
$$\frac{-162}{6}-\frac{60}{4\times 5-7\times 5}+\frac{102}{-1-2}$$
$$-27-\frac{60}{4\times 5-7\times 5}+\frac{102}{-1-2}$$
$$-27-\frac{60}{20-7\times 5}+\frac{102}{-1-2}$$
$$-27-\frac{60}{20-35}+\frac{102}{-1-2}$$
$$-27-\frac{60}{-15}+\frac{102}{-1-2}$$
$$-27-\left(-4\right)+\frac{102}{-1-2}$$
$$-27+4+\frac{102}{-1-2}$$
$$-23+\frac{102}{-1-2}$$
$$-23+\frac{102}{-3}$$
$$-23-34$$
$$-57$$
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