$$8-[15-7\times4-\{4-(4\div\overline{6-4})\}]$$
$7xy-\frac{10z}{3}+5y-7$
$$8-\left(15-7xy-5y-\left(\frac{2}{3}-4\right)z\right)$$
$$8-\left(15-7xy-5y-\left(\frac{2}{3}-\frac{12}{3}\right)z\right)$$
$$8-\left(15-7xy-5y-\frac{2-12}{3}z\right)$$
$$8-\left(15-7xy-5y-\left(-\frac{10}{3}z\right)\right)$$
$$8-\left(15-7xy-5y+\frac{10}{3}z\right)$$
$$8-15-\left(-7xy\right)-\left(-5y\right)-\frac{10}{3}z$$
$$-7-\left(-7xy\right)-\left(-5y\right)-\frac{10}{3}z$$
$$-7+7xy-\left(-5y\right)-\frac{10}{3}z$$
$$-7+7xy+5y-\frac{10}{3}z$$
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