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an algebraic expression
Variable is any letter used in an algebraic expression, and can vary (change form) to be any number, and one variable means the same number in any single algebraic expression. Usually algebra is simplifying the expression or equation until you know what the variable is equal to.
They are identical or equivalent.
Because "x" is a variable, it is the same as 9 times x.
Just multiply the coefficients, leave the variable the same, and add the exponents.