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 Related Terms
 Open Sentence:  A sentence that has symbols or variables representing unknown values.
Equation: A mathematical sentence that contains an equals sign.
Inequality: Any mathematical sentence that contains the symbols >(greater than), <(less than), <(less than or equal to), or >(greater than or equal to).
Algebraic Expression: A mathematical phrase involving at least one variable and sometimes numbers and operation symbols.
Variable: A letter or symbol used to represent a number.
Operation: A mathematical process that combines two or more numbers.
Algebraic Expression: A mathematical phrase involving at least one variable and sometimes numbers and operation symbols.
Equation: A mathematical sentence that contains an equals sign.