Вопрос:

Ответ:

\[f(x) = - \frac{1}{3}x + 2\]

\[f(x) = 0:\]

\[0 = - \frac{1}{3}x + 2\]

\[\frac{1}{3}x = 2\]

\[x = 2 \cdot 3\]

\[x = 6.\]