Verified answer

Объяснение:

1) домножаем обе части на 8:

5х - 3 = 4х + 24 + 22 - 6х

7х = 49

х = 7

7^2 + 1 = 50

А)

2) домножаем обе части на 6:

4х + 2 + 12 = 9х - 6 + 2х + 2

4х - 11х = - 18

-7х = - 18

х = 18/7

18 * 7 / 18 = 7

B)

3)  3(x + 3) = 5(x-2)

3x + 9 = 5x - 10

19 = 2x

x = 19/2

2 * 19/2 + 61 = 19 + 61 = 80

C)

4) 4(3х - 2) = 2(2х + 5)

12х - 8 = 4х + 10

8х = 18

х = 18/8

x = 9/4

4 * 9/4 + 11 = 9 + 11 = 20

D)

5) 1.2x - 1.6 - 0.4x = 1.8x - 1.5 - 2.6

0.8x - 1.8x = - 4.1 + 1.6

-x = -2.5

x = 2.5

2.5 * (2.5 - 0.5) = 2.5 * 2 = 5