The general solution of $\frac{\mathrm{d} y}{\mathrm{~d} x}=\frac{x+y+1}{x+y-1}$ is
- A$y=x+\log (x+y)+\mathrm{c}$, where c is a constant of integration.
- B$y=x-\log (x+y)+\mathrm{c}$, where c is a constant of integration.
- C$y=x-\log (2 x+y)+\mathrm{c}$, where c is a constant of integration.
- D$y=x^2+\log (x+y)+\mathrm{c}$, where c is a constant of integration.
✓ Correct answer: A
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