Решите уравнение: 9x − 8 = 4x + 12.

\[9x - 8 = 4x + 12\]

\[9x - 4x = 12 + 8\]

\[5x = 20\]

\[x = 4.\ \]

\[2)\ 9 - 7 \cdot (x + 3) = 5 - 4x\]