Resposta:
Olá!
[tex] \frac{x - 2}{x} = \frac{12}{20} \\ 12x = (x - 2) \times 20[/tex]
[tex]12x = 20x - 40 \\ 12x - 20 x= - 40 \\ - 12x = - 40[/tex]
[tex]12x = 40
x= 40/12
