1)16х-3=8х-43 2)1,4-0,6(2х-3)=5(0,3х+13,6) 3)(4у+6)х(1,8-0,2у)=0 4)2/x/-3=x+8

Найдем корешки.

1) 16 * х - 3 = 8 * х - 43; 

16 * x - 8 * x = -43 + 3;

8 * x = -40;

x = -40/8;

x = -5.

2) 1,4 - 0,6 * (2 * х - 3) = 5 * (0,3 * х + 13,6); 

1.4 - 1.2 * x + 1.8 = 1.5 * x + 68; 

3.2  - 1.2 * x = 1.5 * x + 68; 

1.5 * x + 1.2 * x = 3.2 - 68; 

2.7 * x = -64.8; 

x = -64.8/3.2; 

x = -20.25. 

3) (4 * у + 6) х (1,8 - 0,2 * у) = 0; 

4 * y + 6 = 0;

1.8 - 0.2 * y = 0;

4 * y = -6;

0.2 * y = 1.8;

y = -3/2;

y = 9;

y = -1.5;

y = 9.

4) 2/x/ - 3 = x + 8; 

2 * x - 3 = x + 8; 

-2 * x - 3 = x + 8; 

2 * x - x = 8 + 3; 

-2 * x - x = 8 + 3; 

x = 11; 

-3 * x = 11; 

x = 11; 

x = -11/3.