I made this random problem:

((x^-7)(y^2)) / ((x^-3) + y^-4))

and I'm trying to simplify it.

So I've gotten down to this:

((x^3)(y^6)) / ((y^4)(x^7)) + x^10)

and I guess this could technically be an acceptable answer but when I punched this into my calculator, I got it simplified to:

(y^6) / ((x^4)(y^4) + x^7)

Can someone show me (with steps please) how to get that final result.

Thank-you!