$$3 \times ( 4 \times 5 ^ { 2 } ) \div 5 + 7 - 68$$
$-1$
$$\frac{12\times 5^{2}}{5}+7-68$$
$$\frac{12\times 25}{5}+7-68$$
$$\frac{300}{5}+7-68$$
$$60+7-68$$
$$67-68$$
$$-1$$
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