4х-9=2х+11х=?6х+9=2х+33х=?5х+6=7х-10х=?11х-50=хх=?2х=9х-21х=?

1) 4x - 9 = 2x + 11x;

4x - 2x - 11x = 9;

-9x = 9;

 x = 9.

2) 6x + 9 = 2x + 33x;

 6x - 2x - 33x = -9;

-29x = -9;

x = 9/29.

3) 5x + 6 = 7x - 10x;

  5x - 7x + 10x = -6;

  8x = -6;

  x = -6/8.

4) 11x - 50 = x * x;

  x^2 - 11x + 50 = 0;

  x12 = (11 +- 121 - 4 * 50) / 2 = (11 +- (-79) / 2.

Уравнение не имеет реальных корней.

5) 2x = 9x - 21x;

2x - 9x + 21x = 0;

14x = 0;

x = 0.