Now, the one thing that I do want to emphasize is how these are different than traditional variables, traditional variables that you see in your algebra class, like x plus 5 is equal to 6, usually denoted by lowercase variables. Y is equal to x plus 7. These variables, you can essentially assign values. You either can solve for them. So in this case, x is an unknown. You can subtract 5 from both sides and solve for x. Say that x is going to be equal to 1.