Ответ:

[tex] \frac{0.5}{(x - 8)} = \frac{0.8}{(x - 5)} [/tex]

x≠8; x≠5

[tex] \frac{4}{8(x - 8)} = \frac{4}{5(x - 5)} [/tex]

8x-64=5x-25

8x-5x=-25+64

3x=39

x=39:3

x=13