Реши уравнение: 1-2(5-10) = 15.

Привет! Вот решение уравнений: 1. $1 - 2(5 + x) = 15$ $1 - 10 - 2x = 15$ $-9 - 2x = 15$ $-2x = 24$ $x = -12$ **Ответ: x = -12** 2. $5 - 5(8 + 3x) = 13$ $5 - 40 - 15x = 13$ $-35 - 15x = 13$ $-15x = 48$ $x = -\frac{48}{15} = -\frac{16}{5} = -3.2$ **Ответ: x = -3.2** 3. $2 - 3(7 + 2x) = 11$ $2 - 21 - 6x = 11$ $-19 - 6x = 11$ $-6x = 30$ $x = -5$ **Ответ: x = -5** 4. $2 - 3(2 + 3x) = 14$ $2 - 6 - 9x = 14$ $-4 - 9x = 14$ $-9x = 18$ $x = -2$ **Ответ: x = -2** 5. $6 - 2(3x + 2) = 16$ $6 - 6x - 4 = 16$ $2 - 6x = 16$ $-6x = 14$ $x = -\frac{14}{6} = -\frac{7}{3}$ **Ответ: x = -7/3** 6. $3x - 2(3x + 4) = 10$ $3x - 6x - 8 = 10$ $-3x - 8 = 10$ $-3x = 18$ $x = -6$ **Ответ: x = -6** 7. $2x - 3(3x - 1) = 11$ $2x - 9x + 3 = 11$ $-7x + 3 = 11$ $-7x = 8$ $x = -\frac{8}{7}$ **Ответ: x = -8/7** 8. $3x - 2(3x - 2) = 19$ $3x - 6x + 4 = 19$ $-3x + 4 = 19$ $-3x = 15$ $x = -5$ **Ответ: x = -5** 9. $-4x = 15 - 3(5x - 5)$ $-4x = 15 - 15x + 15$ $-4x = 30 - 15x$ $11x = 30$ $x = \frac{30}{11}$ **Ответ: x = 30/11** 10. $7x = 13 - 2(8x - 7)$ $7x = 13 - 16x + 14$ $7x = 27 - 16x$ $23x = 27$ $x = \frac{27}{23}$ **Ответ: x = 27/23** 11. $-5x = 11 - 2(4x - 2)$ $-5x = 11 - 8x + 4$ $-5x = 15 - 8x$ $3x = 15$ $x = 5$ **Ответ: x = 5** 12. $7 - 3(5x - 3) = -11x$ $7 - 15x + 9 = -11x$ $16 - 15x = -11x$ $16 = 4x$ $x = 4$ **Ответ: x = 4** 13. $16 - 2(5 + x) = 9$ $16 - 10 - 2x = 9$ $6 - 2x = 9$ $-2x = 3$ $x = -\frac{3}{2}$ **Ответ: x = -3/2** 14. $13 - 6(3 - x) = 25$ $13 - 18 + 6x = 25$ $-5 + 6x = 25$ $6x = 30$ $x = 5$ **Ответ: x = 5** 15. $12 - 8(1 - x) = 4$ $12 - 8 + 8x = 4$ $4 + 8x = 4$ $8x = 0$ $x = 0$ **Ответ: x = 0**