Ответ:

1) x = 6

2) x = 9

3) x = 2

Пошаговое объяснение:

1) 2x - 5 = x + 1

2x - x = 1 + 5

x = 6

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

3x - 15 = x + 3

3x - x = 3 + 15

2x = 18

x = 9

3) 7(x + 6) = 4(5x + 4)

7x + 42 = 20x + 16

42 - 16 = 20x - 7x

26 = 13x

x = 2