What is the value of $$\left(24 \div 4 - \frac{2}{3} of \frac{21}{8} \div \frac{1}{4}\right)$$?
$$\left(24 \div 4 - \dfrac{2}{3} of \dfrac{21}{8} \div \dfrac{1}{4}\right) = \dfrac{24}{4} - \dfrac{2}{3} \times \dfrac{21}{8} \times 4 = 6 - 7 = -1$$
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