I am looking for a general expression for an integrating factor μ(x,t) to solve the following diffential equation for x(t)(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\frac{dx}{dt} = \frac{x - f}{x}[/tex]

f = f(t) is an arbitrary function of t with f > 0 and df/dt < 0

Any ideas?

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# Inexact differential equation with unknown function M(t)

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