1)2х - 4 = - 6х - 20 2)- 4х -

Найдем корни.

1) 2 * х  - 4 = -6 * х - 20; 

2 * x + 6 * x = -20 + 4;

8 * x = -16;

x = -16/8;

x = -2.

2) -4 * х - 7 = 2 * х + 15; 

-4 * x - 2 * x = 15 + 7;

-6 * x = 22;

x = -22/6;

x = -11/3.

3) 7 * х + 12 = -10 * х - 3; 

7 * x + 10 * x = -3 - 12;

17 * x = -15;

x = -15/17;

4) 33 - 5,5 * х = -15 - 8 * х; 

-5.5 * x + 8 * x = -15 - 33;

3 * x - 0.5 * x = -40 - 8;

2.5 * x = -48;

x = -48/2.5;

x = -19.2.

5) -24 + 3 * х = 9 * х + 18; 

3 * x - 9 * x = 18 + 24; 

-6 * x = 30 + 12; 

-6 * x = 42; 

x = -42/6; 

x = -21/3; 

x = -7.