An addition equation such as or represents a relationship in which the unknown addend can be determined by subtracting the known addend from the total; the learner applies the inverse relationship between addition and subtraction while preserving equality. Solutions may involve whole numbers, integers, fractions, or decimals and can be checked by substitution. The scope is limited to one-step equations, not multi-step equations or equations requiring more advanced algebraic techniques.
An addition equation shows that an unknown number is being added to a known number. To find the unknown, use the inverse operation: subtraction.
Example:
Since the statement is true, the solution is
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