It's the value that when substituted in for the variable, makes the equation true.
Ex: x + 1 = 3
The value 2, when substituted for the variable x, makes the equation true.
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That's the "solution" of the equation.
The Solution of an equation is the value of the variable that makes the equation truean answer
You substitute the value of the variable into the equation and simplify. If the rsult is a true statement then that value of the variable really does satisfy the equation.
a solution
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.