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

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 действительных корней.

5) 2x = 9x - 21x;

2x - 9x + 21x = 0;

14x = 0;

x = 0.