Solution
It's callled the "solution" of the equation.
Such a value is called a "solution" or "root" of an equation.
a solution to an equation is the answer
I assume you mean, in an equation. Such a number is called a "solution" or a "root" of the equation.
Solution
The solution
The answer to an equation is called the solution.
a solution
Solution
The solution
You simply call it "no solution".
It's called the "solution" of the equation.
Sum
solution
That is called a solution.
It's callled the "solution" of the equation.