5. 8,36 − 5,36 : (0,2x + 0,47x) = 7,56

\[8.36-\frac{5.36}{0.2x+0.47x}=7.56\]

\[\frac{5.36}{0.67x}=8.36-7.56=0.8\]

\[0.67x=5.36:0.8=6.7,\quad x=10\]

Проверка: \(8.36-5.36:(0.2\cdot10+0.47\cdot10)=8.36-5.36:6.7=7.56\).

Ответ: \(x=10\).