Every term is 0. All of the other, I don't know, what is it, n minus 1 terms, they're all 0. So all we're left with is that this is equal to n choose 1 of x to the n minus 1. And what's n choose 1? That equals n factorial over 1 factorial divided by n minus 1 factorial times x to the n minus 1. 1 factorial is 1. And if I have 7 factorial divided by 6 factorial, that's just 7.