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use only positive exponents in answer
2u^-9 x^-7 y^-4 * 7u^9 * 3y^-1 x
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2U^-9X^-7Y^-4 * 7U^9 * 3XY^-1.
42U^0X^-6Y^-5=
42 / X^6Y^5.
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