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• Algebra Balance Scales - NLVM
• Algebra Balance Scales - Negatives - NLVM
• E-Lab, Modeling Addition and Subtraction
• E-Lab, Exploring Equations
• Illuminations: Spreadsheet and Graphing Calculator
• Algebra.Help -- Equation Calculator
• Quadratic Equation Calculator
• Webmath.com: Solve a linear equation involving one unknown
• Webmath.com: Solve a simultaneous set of two linear equations
• Linear Equation Solver
• Aplusmath.com -> Games -> Algebra Planet Blaster
• Quia - Solve 1-Step Equations
• Quia - Systems of equations Jeopardy
• Quia - Linear Equations in one Variable