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http://study.com/academy/practice/quiz-worksheet-solving-equations-with-infinite-or-no-solutions.html
https://www.khanacademy.org/math/algebra/one-variable-linear-equations/solutions-linear-equations/e/solutions-to-linear-equations
http://study.com/academy/practice/quiz-worksheet-solving-equations-with-infinite-or-no-solutions.html
https://www.khanacademy.org/math/algebra/one-variable-linear-equations/solutions-linear-equations/e/solutions-to-linear-equations