Question

Simplify the following:
$84-\left\{10+4-66+\left(42\times 2\right)-\overline{8+5}\right\}+9$

Answer 1

$$\begin{gathered} 84-\left\{10+4-66+\left(42\times 2\right)-\overline{8+5}\right\}+9 \\ \Rightarrow 84-\{10+4-66+\left(42\times 2\right)-13\}+9 \\ \Rightarrow 84-\{10+4-66+84-13\}+9 \\ \Rightarrow 84-\left\{98-79\right\}+9 \\ \Rightarrow 84-\left\{19\right\}+9 \\ \Rightarrow 84-19+9 \\ \Rightarrow 93-19 \\ \Rightarrow 74 \end{gathered}$$