Why Is This First Order Non Linear Differential Equation So Challenging?

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Homework Statement



(8x^2y^3-2y^4)dx+(5x^3y^2-8xy^3)dy=0

Homework Equations


The Attempt at a Solution



I've already tried the most logical steps. The equation isn't exact and I couldn't find an integrating factor to make it exact. It's also not homogeneous or separable. I have to be making an error somewhere. I've done all my other questions but this one is just killing me. Help please!
 
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(8x^2y^3-2y^4)dx+(5x^3y^2-8xy^3)dy=0
...
I've already tried the most logical steps.
Did you get rid of the common factor of y^2 :$$\frac{dy}{dx}=\frac{2y^2-8x^2y}{5x^3-8xy}$$
... where does this come from?
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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