$$12/2-4/2-42/7-20/4$$
$-7$
$$6-\frac{4}{2}-\frac{42}{7}-\frac{20}{4}$$
$$6-2-\frac{42}{7}-\frac{20}{4}$$
$$4-\frac{42}{7}-\frac{20}{4}$$
$$4-6-\frac{20}{4}$$
$$-2-\frac{20}{4}$$
$$-2-5$$
$$-7$$
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