Khan/khan-exercises — pull request #45862 by petercollingridge (2013-05-15 23:17:58+00:00)
Title: Extraneous Solutions to Rational Equations

Solve a rational equation and ignore any extraneous solutions.
(Should maybe make it clear that there can be 1 or 2 solutions).

Based on this video: https://www.khanacademy.org/math/algebra/rational-expressions/rational_expressions/v/extraneous-solutions-to-rational-equations