x usually is the unknown that is the factor you have to solve for. It can be any letter but it commonly x. I know this because I had the hardest time in algebra in college. In fact I hated it and really can't remember much more than that. Good Luck I hope you have a much better teacher than I had.
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In algebra, one solution means that there is only one real value x that will satisfy its equation.
It is an algebraic term and it means 2 times x
x2
The range of a set is the y value in comparison to the domain which is the x value.
In Algebra, "is" means Equal (=).