a variable expression in math is a symbol that is in a sentence
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Assigns the value of an expression to a variable or property.
a numerical or constant quantity placed before and multiplying the variable in an algebraic expression
A variable expression for 5 divided by r would be 5/r. In algebra, when a number is divided by a variable, it is represented as the number (in this case, 5) divided by the variable (r). This expression shows the quotient of 5 and r, where r can be any real number except 0 to avoid division by zero error.
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That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.