№9. Решите уравнение: 1) 3x+18=5x-4; 2) 6x-2(2x+8) + 1 = -6x+9; 3) (6x-6)/5 = (3x+4)/ 10. 4)-3x-14-8x + 16; 5) 10x-3(2x+4)+2=2x+8; 6)x4x+2)/3 = (5x-2)/9.

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Accepted Answer

1) 3x + 18 = 5x - 4 => 22 = 2x => x = 11

2) 6x - 4x - 16 + 1 = -6x + 9 => 2x - 15 = -6x + 9 => 8x = 24 => x = 3

3) 2(6x - 6) = 3x + 4 => 12x - 12 = 3x + 4 => 9x = 16 => x = 16/9

4) -11x + 2 = 0 => 11x = 2 => x = 2/11

5) 10x - 6x - 12 + 2 = 2x + 8 => 4x - 10 = 2x + 8 => 2x = 18 => x = 9

6) 3x(4x + 2) = 5x - 2 => 12x^2 + 6x = 5x - 2 => 12x^2 + x + 2 = 0. Дискриминант < 0, решений нет.