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An expression written with 1 or more variables is called an equasion
That sounds like the definition for Recursive Formula.
Any expression that contains one or more variable, such as x; x+2; x+y; x2, etc. Depending on the values of the variables, the expression can also have different values.
It means that it is an expression, and it contains one or more variables. An "expression" is anything that can be calculated to obtain a number. For example, all of the following are expressions: 5 1 + 2 a a + 1 2a a + b
It is a more complicated mathematical expression.