$$180 \div 4 \div 5-14 \times 7+140 \div 2+30$$
$11$
$$\frac{180}{4\times 5}-14\times 7+\frac{140}{2}+30$$
$$\frac{180}{20}-14\times 7+\frac{140}{2}+30$$
$$9-14\times 7+\frac{140}{2}+30$$
$$9-98+\frac{140}{2}+30$$
$$-89+\frac{140}{2}+30$$
$$-89+70+30$$
$$-19+30$$
$$11$$
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