Answer:
We have \[222-\left[ \frac{1}{3}\left\{ 42+\left( 56-\overline{8+9} \right) \right\}+108 \right]\] \[=222-\left[ \frac{1}{3}\left\{ 42+\left( 56-17 \right) \right\}+108 \right]\] [Removing vinculum] \[=222-\left[ \frac{1}{3}\left\{ 42+39 \right\}+108 \right]\] [Removing parentheses] \[=222-\left[ \frac{81}{3}+108 \right]\] [Removing braces] = 222 - [27 + 108] = 222 -135 =87
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