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http://www.math-play.com/soccer-math-one-step-equations-game/one-step-equations-game.html
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http://www.math-play.com/equation-word-search/equation-word-search.html
http://www.math-play.com/Equation/Equation-Game-Online.html
https://www.ltcconline.net/greenl/java/BasicAlgebra/inequalityGame/inequalities.html