$$73 \times 3+88 \times 4-78 \times 4+62/2-680$$
$-390$
$$219+352-78\times 4+\frac{62}{2}-680$$
$$571-78\times 4+\frac{62}{2}-680$$
$$571-312+\frac{62}{2}-680$$
$$259+\frac{62}{2}-680$$
$$259+31-680$$
$$290-680$$
$$-390$$
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