Substitute that value in the equation, and then check to see if the resulting statement is TRUE.
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That's the "solution" of the equation.
a solution
The Solution of an equation is the value of the variable that makes the equation truean answer
Isolating a single variable in terms of the rest of the equation provides a solution to that variable. That is, if you know the equation that equals the variable, then you can figure out its value.
You call that a "solution" of the equation.