1) 4 * х + 10 = -10; 

4 * x = -10 - 10; 

4 * x = -20; 

x = -20/4; 

x = -5.

2) 2 * х - 10 = -3; 

2 * x = -3 + 10;

2 * x = 7;

x = 7/2;

x = 3.5.

3) 2 * х + 6 = 8; 

2 * x = 8 - 6; 

2 * x = 2; 

x = 2/2; 

x = 1.