The expression "x - 2" represents a simple algebraic equation where x is a variable. This means that x can take on different numerical values, and the expression indicates that 2 is being subtracted from whatever value x represents. For example, if x equals 5, then "x - 2" would equal 3. In mathematics, this expression is often used in equations and functions. It can help in solving problems where you need to find the value of x that satisfies a particular condition. Understanding how to manipulate expressions like "x - 2" is fundamental in algebra.