2x-7=15

An equation like 2x-7=15 is very easy to solve using simple algebra. The goal is to get x by itself so you can know what its value is.  The first step in solving this problem is to add seven to itself, to cancel itself out, and then add seven to fifteen to get twenty-two. You do this because in an equation you have to add a term to both sides to cancel it out.  Now the equation is 2x=22.  The next step is to divide both sides by two to get x by itself.  You divide two by two to cancel itself out, then you divide twenty-two by two to get eleven.  Now x is by itself and all that is left is x=11. This is how you find the value of x in a simple equation such as this one.