negative exponent elimination

Paper says that "negative exponents can be eliminated by replacing a negative power with its reciprocal" with the example of

(x^-3)(x^2)

------------

(x^-7)

becoming

(x^2)(x^7)

-----------

(x^3)

reducing out to x^6. how would the be done with (x^5)(X^-8) (no given denominator), just one numerator and denominator

x^5

----

x^-4

and two numerators and denominators ( i know i'm not using those terms right, but i think you get what i mean)

(x^4)(x^-6)

------------

(x^-5)(x^-2)

thanks once again