Реши уравнения: 1. 6(x-3) = 12

Решаю уравнения: 1. $6(x-3) = 12$ $6x - 18 = 12$ $6x = 30$ $x = 5$ 2. $14 = 7(x + 2)$ $14 = 7x + 14$ $7x = 0$ $x = 0$ 3. $12x + 4 = 3(4x - 2)$ $12x + 4 = 12x - 6$ $4 = -6$ (нет решения) 4. $3x + (2x - 1) = 10$ $5x - 1 = 10$ $5x = 11$ $x = 2.2$ 5. $(3x - 2) - (x - 1) = 10$ $3x - 2 - x + 1 = 10$ $2x - 1 = 10$ $2x = 11$ $x = 5.5$ 6. $2(x - 1) - 4 = 6(x + 2)$ $2x - 2 - 4 = 6x + 12$ $2x - 6 = 6x + 12$ $-4x = 18$ $x = -4.5$ 7. $6x - 3(x - 1) = 4 + 5x$ $6x - 3x + 3 = 4 + 5x$ $3x + 3 = 4 + 5x$ $-2x = 1$ $x = -0.5$ 8. $5x + 18 = 7x + 6(3x - 7)$ $5x + 18 = 7x + 18x - 42$ $5x + 18 = 25x - 42$ $-20x = -60$ $x = 3$ 9. $12 + 4(x - 3) - 2x = (5 - 3x) + 9$ $12 + 4x - 12 - 2x = 5 - 3x + 9$ $2x = 14 - 3x$ $5x = 14$ $x = 2.8$ **Ответы:** 1. $x = 5$ 2. $x = 0$ 3. Нет решения. 4. $x = 2.2$ 5. $x = 5.5$ 6. $x = -4.5$ 7. $x = -0.5$ 8. $x = 3$ 9. $x = 2.8$