I didn't get very far after differentiating with respect to x; here's my step 1): .
I have several questions. Can I multiply by another to get ?
If not, I'll show the steps I went through with a brief explanation: I moved a dy/dx and the +1 to different sides and then factored out a dy/dx:
Solved for dy/dx
Differentiated again with respect to x using quotient rule / chain rule.
Simplified the top by distributing the negative one and multiplying the dy/dx terms (if that's legal).
Substituted dy/dx back into the game.
Multiplied lowest denominator across the middle denominator.