Решение:
1) \(4(x - 3) = x + 6\)
\(4x - 12 = x + 6\)
\(4x - x = 6 + 12\)
\(3x = 18\)
\(x = 6\)
**Ответ: x = 6**
2) \(4 - 6(x + 2) = 3 - 5x\)
\(4 - 6x - 12 = 3 - 5x\)
\(-6x + 5x = 3 - 4 + 12\)
\(-x = 11\)
\(x = -11\)
**Ответ: x = -11**
3) \((5x + 8) - (8x + 14) = 9\)
\(5x + 8 - 8x - 14 = 9\)
\(-3x - 6 = 9\)
\(-3x = 9 + 6\)
\(-3x = 15\)
\(x = -5\)
**Ответ: x = -5**