The equation "x + 2 = 5" is a simple algebraic expression where x represents an unknown value. To solve for x, you need to isolate it on one side of the equation. This is done by subtracting 2 from both sides, leading to the equation "x = 5 - 2." After performing the subtraction, you find that "x = 3." This means that when you add 2 to 3, you get 5, confirming that the solution is correct. This process of finding the value of x is a fundamental concept in algebra.