Take into account it is necessary to solve the inner parenthesis first, and next the brackets, just as follow:
3[(4-8+2⁴(2+5))] =
3[(4-8+2⁴(7))] =
3[(4-8+(16)(7))] =
3[(4-8+112)] =
3[(108)] =
324
Hence, the simplified xpression is equal to 324
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