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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:

2)

Solved for dy/dx

3)

Differentiated again with respect to x using quotient rule / chain rule.

4)

Simplified the top by distributing the negative one and multiplying the dy/dx terms (if that's legal).

5)

Substituted dy/dx back into the game.

6)

Multiplied lowest denominator across the middle denominator.

7)