Simplifying Expressions
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1.) (-2a^8 / b³)^5
2.) -15y^13 / 45y^9
3.)
49x^7 -28x^5 -7x^4
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7x³
4.) 25x^8 - 50x^7 + 3x^6 - 40x^5
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-5x^5
5.) 4^-2
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