What is the value of $$6\frac{1}{2} + 80 \div 40 - \frac{30}{7} of \left(5 - \frac{1}{3}\right)$$?
$$6\frac{1}{2} + 80 \div 40 - \frac{30}{7} of \left(5 - \frac{1}{3}\right) = \dfrac{13}{2} + \dfrac{80}{40} - \dfrac{30}{7} \times \dfrac{14}{3}$$
$$= \dfrac{13}{2} + 2 - 20 = \dfrac{13}{2} - 18$$
$$= \dfrac{13-36}{2} = \dfrac{-23}{2}$$
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