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Simplify the expressions. (Simplify your answers completely. Use only positive exponents for your answers. ) ( am . a -n ) - 4 ( am

Simplify the expressions. (Simplify your answers completely. Use only positive exponents for your answers. ) ( am . a -n ) - 4 ( am + 1 ) 4 x20 - 2 20 \\ 1/3 x 50 + 4 -n

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