Simplify the rational expression [math]\frac{x−3}{3-x}[/math].

[list=1][br][*]Identify any invalid values of the expression.[br][/*][*]Rewrite the numerator with –1 as a factor.[br][/*][*]Simplify the result to find an equivalent expression.[br][/*][/list][br]This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit [url=http://www.walch.com/]www.walch.com[/url] for more information.