(c) Given, $x = e^{y + x}$ $\Rightarrow {\ \ log\ }{x =}\ (y + x)\ \ \Rightarrow \ \ \frac{1}{x} = \frac{dy}{dx} + 1$ $\Rightarrow \ \frac{dy}{dx}$ = $\frac{1 - x}{x}$
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Ph.D. in Physics with 19+ years of teaching experience.