Simplify the rational expression

-12x^3/x^3-5x^4

Simplifying the rational expression " - 12x^3/x^3-5x^4" involves cancelling out the terms or variables that are common or present in each term. For this example, the common term is "x^3". So for the first step, bring out all of the x^3 terms. This gives:

--> - 12x^3/x^3 (1-5x)

Since this is a fraction, the x^3 can be cancelled out from the numerator and denominator.

final answer - - > - 12 / (1-5x)