Question 494613
The negative sign means "invert".
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24x^3y^-3/72x^-5y^-1 
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(24/72)(x^3/x^-5)(y^-3/y^-1}
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= 3 * x^8 * (1/y^2)
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= 3x^8/y^2
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Cheers,
Stan H.
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