Решите уравнение 3х+х+2=18 ; 4х-2=14 ; 3х-12=х ; 4х-2=2х+6 ; 2х-2=6+4х

Найдем х в уравнениях.

1) 3 * х + х + 2 = 18; 

3 * x + x = 18 - 2;

x * (3 + 1) = 16;

x * 4 = 16;

4 * x = 16;

x = 16/4;

x = 4.

2) 4 * х - 2 = 14; 

4 * x = 14 + 2;

4 * x = 16;

x = 16/4;

x = 4.

3) 3 * х - 12 = х; 

3 * x - x = 12;

x * (3 - 1) = 12;

x * 2 = 12;

x = 12/2;

x = 6.

4) 4 * х - 2 = 2 * х + 6; 

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

x * (4 - 2) = 8;

2 * x = 8;

x = 8/2;

x = 4.

5) 2 * х - 2 = 6 + 4 * х; 

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

-2 * x = 8;

x = -8/2;

x = -4.

6) 2 * х + 6 = 4 * х - 2; 

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

-2 * x = -8;

2 * x = 8;

x = 8/2;

x = 4.

7) -4 * х - 4 = 2 * х + 8; 

-4 * x - 2 * x = 8 + 4; 

-6 * x = 12; 

x = -12/6; 

x = -2.