1 ) I have this equation and don't know how $(1 + 2e^y)$ and $(1 + 2e^x)$ from each side of equation cancelled each other out and get the final answer $x = y$.
$\frac{e^x}{1+2e^x}=\frac{e^y}{1+2e^y}$
$e^x(1 + 2e^y) = e^y(1 + 2e^x)$
$e^x = e^y$
$x = y$
Question 2 - I don't know how the equation turned into fraction in the last step. Appreciate much for fast reply :)
$y =\frac{e^x}{1+2e^x}$
$e^x = y + 2ye^x$
$e^x =\frac{y}{1-2y}$ (How does $y + 2ye^x$ turned into this?)