Решите уравнения: 12. -5x = 11 - 2(4x - 2); 13. 7 - 3(5x - 3) = -11x; 14. 16 - 7(5 - x) = 9; 15. 13 - 6(3 - x) = 25; 16. 12 - 8(4 - x) = 4; 17. 15 - 4(7 - x) = 11; 18. 6 - 5(4x - 1) = 3; 19. 6 = 8 - 5(7x - 1); 20. 4 = 7 - 6(5x - 1); 21. 5 = 12 - 5(4x - 1).

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12. $-5x = 11 - 2(4x - 2)$ $-5x = 11 - 8x + 4$ $-5x + 8x = 15$ $3x = 15$ $x = 5$ 13. $7 - 3(5x - 3) = -11x$ $7 - 15x + 9 = -11x$ $16 - 15x = -11x$ $-15x + 11x = -16$ $-4x = -16$ $x = 4$ 14. $16 - 7(5 - x) = 9$ $16 - 35 + 7x = 9$ $-19 + 7x = 9$ $7x = 9 + 19$ $7x = 28$ $x = 4$ 15. $13 - 6(3 - x) = 25$ $13 - 18 + 6x = 25$ $-5 + 6x = 25$ $6x = 25 + 5$ $6x = 30$ $x = 5$ 16. $12 - 8(4 - x) = 4$ $12 - 32 + 8x = 4$ $-20 + 8x = 4$ $8x = 4 + 20$ $8x = 24$ $x = 3$ 17. $15 - 4(7 - x) = 11$ $15 - 28 + 4x = 11$ $-13 + 4x = 11$ $4x = 11 + 13$ $4x = 24$ $x = 6$ 18. $6 - 5(4x - 1) = 3$ $6 - 20x + 5 = 3$ $11 - 20x = 3$ $-20x = 3 - 11$ $-20x = -8$ $x = 0,4$ 19. $6 = 8 - 5(7x - 1)$ $6 = 8 - 35x + 5$ $6 = 13 - 35x$ $35x = 13 - 6$ $35x = 7$ $x = 0,2$ 20. $4 = 7 - 6(5x - 1)$ $4 = 7 - 30x + 6$ $4 = 13 - 30x$ $30x = 13 - 4$ $30x = 9$ $x = 0,3$ 21. $5 = 12 - 5(4x - 1)$ $5 = 12 - 20x + 5$ $5 = 17 - 20x$ $20x = 17 - 5$ $20x = 12$ $x = 0,6$

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