1) (8х + 3) – (10х + 6) = 9;
2) 2(7х - 7) = 7(2х - 3) + 7;
3) 5(х - 12) = 6(х - 10) – х;
4) 7(4х - 1) = 6 – 2(3 – 14х);
5) 5,6 – 3(2 – 0,4х) = 0,4(4х

Пошаговое объяснение:

1)

(8х + 3) – (10х + 6) = 9;

8x + 3 - 10x - 6 = 9

-2x - 3 = 9

2x = -3 - 9

2x = -12

x = -12 : 2

x = -6

2)

2(7х - 7) = 7(2х - 3) + 7;

14x - 14 = 14x - 21 + 7

14x - 14 = 14x - 14

14x - 14x = 14 - 14

0 = 0

x є (-∞;∞)

3)

5(х - 12) = 6(х - 10) – х;

5x - 60 = 6x - 60 - x

5x - 60 = 5x - 60

5x - 5x = 60 - 60

0 = 0

x є (-∞;∞)

4)

7(4х - 1) = 6 – 2(3 – 14х);

28x - 7 = 6 - 6 + 28x

28x - 7 = 28x

28x - 28x = 7

0 ≠  7

нет решений

5)

5,6 – 3(2 – 0,4х) = 0,4(4х - 1)

5,6 - 6 + 1,2x = 1,6x - 0,4

1,2x - 0,4 = 1,6x - 0,4

1,6x - 1,2x = 0,4 - 0,4

0,4x = 0

x = 0