Решите уравнения:15х-8х+х=208,2х-х+13х=168,4у+2у+17=167,47+13а-7а=53,27b-15b-21=15,55-(13х+2х)=25.

Найдем корешки.

1) 15 * х  - 8 * х + х = 208;

7 * x + x = 208;

8 * x = 208;

x = 208/8;

x = 104/4;

x = 52/2;

x = 26.

2) 2 * х - х + 13 * х = 168;

14 * x = 168;

x = 168/14;

x = 12.

3) 4 * у + 2 * у + 17 = 167;

6 * y + 17 = 167;

6 * y = 167 - 17;

6 * y = 150;

2 * y = 50;

y = 50/2;

y = 25.

4) 47 + 13 * а - 7 * а = 53;

47 + 6 * a = 53;

6 * a = 53 - 47;

6 * a = 6;

a = 6/6;

a = 1.

5) 27 * b - 15 * b - 21 = 15;

12 * b - 21 = 15;

12 * b = 15 + 21;

12 * b = 36;

b = 36/12;

b = 3.

6) 55 - (13 * х + 2 * х) = 25; 

55 - 15 * x = 25; 

15 * x = 55 - 25; 

15 * x = 30; 

x = 30/15; 

x = 2.