Answer:
[tex]x = r - h[/tex]
Step-by-step explanation:
When solving for x, we want to get x all by itself on one side of the equals side. It doesn't matter which side.
In this case, we have x + h. Since we want x alone we have to get rid of the h. We can do this by subtracting h from both sides (whatever you do to one side, you have to do to the other side).
[tex]r = x + h \\ r - h = x + h - h \\ r - h = x[/tex]
Therefore, x = r - h.
