DEL EN
<tex> \frac{x^2-25}{x^2+10x+25} = \frac{(x+5)(x-5)}{(x+5)(x+5)} = \frac{x-5}{x+5}</tex>
<tex> 3^{2x-1} = 1 \\ 3^{2x-1} = 3^0 \\ 2x-1 = 0 \\ x= \frac 12</tex>