What is the value of $$\left(\frac{5}{2} of 5 \div 4 - 2 of \frac{1}{7} \div \frac{1}{7}\right)$$?
$$\left(\frac{5}{2} of 5 \div 4 - 2 of \frac{1}{7} \div \frac{1}{7}\right) = \dfrac{5}{2} \times \dfrac{5}{4} - 2\times \dfrac{1}{7} \times 7 = \dfrac{25}{8} - 2 = \dfrac{25-16}{8} = \dfrac{9}{8}$$
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