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I have the following ODE:

$ \frac{dy}{dz} + \frac{y(x+y)}{(y-x)(2x+2y+z)} = 0$

where z is a function of x and y, i.e. $z(x,y)$.

For an example in two variables, I used integrating factor but I can't seem to separate this enough to do that. Do I need to simplify the expression, or use some substitution?

Any suggestions appreciated.

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    See my solution for your [other problem](http://math.stackexchange.com/questions/245217/partial-differential-with-integrating-factor).2012-11-27

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