For those of you who want a bit more practice working with variables, here are a few equations to try. Your job is to figure out what the letter ("n") equals, but you must show your work, even if you can solve these in your head.
n - 7 = 5
n + 4 = 16
n - 3 = 11
n x 5 = 15
Remember, your equation is like a teeter-totter, so whatever you do to one side you must also do to the other.