👉 In mathematics, an expression is a group of symbols that combines to form a number. These symbols can be numbers, variables, and mathematical operations like addition, subtraction, multiplication, division, and exponentiation, but they cannot contain any other symbols. For example, in the expression 5x + 3y - 7, x and y are both numbers (they represent variables), while the operation - is a symbol representing subtraction. This expression defines a single number that can be manipulated as follows
