Comic #28 - "The One that is Out of Whack"

Just finished up comic #28. This one is different from the rest. It's larger for one. I needed more room so the text was legible. The second thing is it's not side by side panels, these ones are overlapping. So a few changes. Meh...enjoy.



















Bonus points to whoever can solve it.
Below: What I think the answer is. I'm probably wrong.

ydy - 4(x+y²)dy = 0
y(udy + ydu) - 4(uy + y²)dy = 0
uydy + y²du - 4uydy + 4y²dy = 0
-3uydy + y²du + 4y²dy = 0
-3uydy + 4y²dy = -y²du
y + 4y^6 + y² dy = -(1/3u) du
5y^8 dy = -1/3(1/u) du
(5y^9)/9 = -(1/3)ln|x/y| + C
e^((5y^9)/9) = C(x/y)^(-1/3)

Hmm. Studying and drawing comics at the same time is possible.