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7.8: Solving Equations Using the Subtraction and Addition Properties of Equality
https://stats.libretexts.org/Courses/Fullerton_College/Math_121%3A__Support_for_Introductory_Probability_and_Statistics/07%3A_Operations_on_Numbers/7.08%3A_Solving_Equations_Using_the_Subtraction_and_Addition_Properties_of_Equality
To determine whether a number is a solution to an equation, first substitute the number for the variable in the equation. Then simplify the expressions on both sides of the equation and determine whet...To determine whether a number is a solution to an equation, first substitute the number for the variable in the equation. Then simplify the expressions on both sides of the equation and determine whether the resulting equation is true. If it is true, the number is a solution. If it is not true, the number is not a solution. The Subtraction and Addition Properties of Equality help in solving for the variable in an equation.

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