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mathematics - Programmatically solving a math puzzle with four unknowns and four equations - Puzzling Stack Exchange
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Cross Sum Volume 4: The Fun Number Puzzle Game That Uses Math Operators To Solve! (Number Puzzle Games) | lagear.com.ar
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Sudoku & Cross Sum: 100 Easy Sudoku and 100 Easy Cross Sum Puzzles & Solutions (Number Puzzle Games) : Kness, Ron: Amazon.com.tr: Kitap
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