A what is a number that makes an equation true?

A number that makes an equation true is often referred to as a "solution" or "root" of the equation. When substituted into the equation, this number satisfies the equality, making both sides of the equation equal. For instance, in the equation (x + 2 = 5), the number 3 is a solution because substituting it for (x) results in a true statement: (3 + 2 = 5).