Решите уравнение 9-7(x+3)=5-4x.

Ответ:

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

\[9 - 7x - 21 = 5 - 4x\]

\[- 7x + 4x = 5 + 12\]

\[- 3x = 17\]

\[x = - \frac{17}{3}\]

\[x = - 5\frac{2}{3}.\]