Решите уравнение 4x/5=(x-9)/2.

\[\frac{4x}{5} = \frac{x - 9}{2}\ \ \ \ \ \ \ \ \ \ \ \ | \cdot 10\]

\[2 \cdot 4x = 5 \cdot (x - 9)\]

\[8x = 5x - 45\]

\[8x - 5x = - 45\]

\[3x = - 45\]

\[x = - 45\ :3\]

\[x = - 15.\]

\[Ответ:x = - 15.\]