Question
$2550-[510-\{270-(90-\overline{80+7})\}]$
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Answer
$\begin{aligned} & 2550-[510-\{270-(90-\overline{80+7})\}] \\ & =2550-[510-\{270-(90-87)\}] \\ & =2550-[510-\{270-3\}] \\ & =2550-[510-267] \\ & =2550-243 \\ & =2307\end{aligned}$
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