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$\mathit{S}\mathit{o}\mathit{l}\mathit{v}\mathit{e}\mathbf{ }\mathbf{:}\mathbf{ }\left(1 + 3e^{\raisebox{1ex}{$y$}\!\left/ \!\raisebox{-1ex}{$x$}\right.}\right) dy + 3e^{\raisebox{1ex}{$y$}\!\left/ \!\raisebox{-1ex}{$x$}\right.} \left(1 - \frac{y}{x}\right) dx = 0$