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![\bf [(-5)^{-7}(-5)^8]^3\implies \left[(-5)^{-7+8} \right]^3\implies \left[ (-5)^1 \right]^3 \\\\\\ (-5)^{1\cdot 3}\implies (-5)^3\implies (-5)(-5)(-5)\implies -125](/tpl/images/0102/6485/18032.png)
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Simplify the expression. [(–5)–7 (–5)8]3...
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