The value of the variable that makes the equation true is called a solution.
In mathematical terms, when you have an equation, you are looking to find the value(s) that will satisfy that equation. For instance, in the equation x + 2 = 5, the solution is the value of x that, when substituted back into the equation, makes both sides equal. So, if we solve x + 2 = 5, we subtract 2 from both sides, which gives us x = 3. Thus, the solution to this equation is 3.
In summary, when you hear someone refer to the ‘solution’ of an equation, they are simply talking about the value(s) of the variable that render the equation true.