And so I could write a constant like that. I could call that c one, and then I could call this c two, but it really is just some arbitrary constant. And we're done. Oh, actually, no, we aren't done. We still just have our entire thing in terms of u. So now let's unsubstitute it. So this is going to be equal to 2 over 21 times u to the 3 1⁄2.