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Ответ:

Пошаговое объяснение:

1) 3x - 15 = x + 3;

3x-x = 3+15

2x = 18

x = 18:2

x = 9

2) 7 - 3x = x + 11;

x+3x = 7 - 11

4x = -4

x = -4:4

x = -1

3) 2(x + 3) = x + 13;

2x + 6 = x + 13

2x - x = 13 - 6

x = 7

4) 4(5 - x) = 3x - 1;

20 - 4x = 3x - 1

3x + 4x = 20 + 1

7x = 21

x = 21 : 7

x = 3

5) 3(x - 2) = x + 4;

3x - 6 = x + 4

3x - x = 4+6

2x = 10

x = 10:2

x = 5

6) 5(x - 1) = 4x + 3.

5x - 5 = 4x + 3

5x - 4x = 3+5

x = 8

Пошаговое объяснение:

простите за жирную точку во втором примере