To learn how to solve for x, we should start with a simple equation like this:
2 + 2= x
We know that 2 + 2 = 4, which means that x must equal 4. The equation answer is therefore x = 4.
Another simple equation could be:
5 + 3 > 3 + x
We know that 5 + 3 = 8. The equation tells us that 8 is greater than (>) 3 + x.
Take 3 away from 8, to get 5.
We can see that x must be less than 5 or x is 4 or less. x < 5 or x <= 4
We cannot say more precisely what x is with the information that we are given.
ALSO there is no magic about using the letter x. You can use any letter you like, although x and y are commonly used to represent the unknown elements of equations.
I hope that this helps!