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Khan Academy
Khan Academy: Equations With One Rational Expression
Solve equations that have one rational expression whose numerator and denominator are linear expressions. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
University of Waterloo (Canada)
University of Waterloo: Math Frog: Solving Equations 2
Race against the clock to see how many simple equations you can solve correctly in three and a half minutes.