I'm working on a calculus problem, but I'm stuck with something algebraically:

$\displaystyle x = y^2-7y$

I'm trying to solve for y so I can graph it. I started by factoring y:

$\displaystyle x = y(y-7)$

But that's as far as I can get. If I divide both sides by y, that still leaves me with x/y = y-7. The extra y on the right side of the equation is stumping me and I can't figure out how to get rid of it. Any ideas?