$$23+3 \times 5-6 \times 6 \div (-4)-5-7$$
$35$
$$23+15-\frac{6\times 6}{-4}-5-7$$
$$38-\frac{6\times 6}{-4}-5-7$$
$$38-\frac{36}{-4}-5-7$$
$$38-\left(-9\right)-5-7$$
$$38+9-5-7$$
$$47-5-7$$
$$42-7$$
$$35$$
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$5\times 7$
