$$[(\frac{-3}{4})^{2}-(\frac{1}{2})^{3}]\times4^{3}$$
$28$
$$\left(\left(-\frac{3}{4}\right)^{2}-\left(\frac{1}{2}\right)^{3}\right)\times 4^{3}$$
$$\left(\frac{9}{16}-\left(\frac{1}{2}\right)^{3}\right)\times 4^{3}$$
$$\left(\frac{9}{16}-\frac{1}{8}\right)\times 4^{3}$$
$$\frac{7}{16}\times 4^{3}$$
$$\frac{7}{16}\times 64$$
$$28$$
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$2^{2}\times 7$
