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Rational expression is in simplest form when both numerator and
denominator have no common factor other than 1.
15x^2 - x - 2
______________
3x^2 - 5x - 2
Factor both numerator and denominator.
(3x + 1) (5x - 2)
= ________________
(3x + 1) (x - 2)
Divide common factors
5x - 2
= ______
x - 2