Решить уровнение: а) 2 3-х = 16 б) 3 2х +

Найдем корешки.

а) 2/(3 - х) = 16; 

Умножим накрест.

16 * (3 - x) = 2;

3 - x = 2/16;

3 - x = 1/8;

-x = 1/8 - 3;

-x = 1/8 - 8/8 - 2;

-x = -2 - 7/8;

-x = -2 7/8;

x = 2 7/8.

б) 3/(2 * х + 7) = 9; 

9 * (2 * x + 7) = 3;

2 * x + 7 = 3/9;

2 * x + 7 = 1/3;

2 * x = 1/3 - 7;

2 * x = -6 2/3;

2 * x = -20/3;

x = -10/3.

в) Log3 (5 * х + 3) = Log3 (7 * х + 5); 

5 * x + 3 = 7 * x + 5; 

5 * x - 7 * x = 5 - 3; 

-2 * x = 2; 

x = -2/2; 

x = -1.