$$2-3[5-4(4-6)]+ { 8 }^{ 2 } /4$$
$-21$
$$2-3\left(5-4\left(-2\right)\right)+\frac{8^{2}}{4}$$
$$2-3\left(5-\left(-8\right)\right)+\frac{8^{2}}{4}$$
$$2-3\left(5+8\right)+\frac{8^{2}}{4}$$
$$2-3\times 13+\frac{8^{2}}{4}$$
$$2-39+\frac{8^{2}}{4}$$
$$-37+\frac{8^{2}}{4}$$
$$-37+\frac{64}{4}$$
$$-37+16$$
$$-21$$
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