Ayudaaa necesito esas ecuaciones y sus verificaciones?

20 + 3x = 40 - 2

3x = 38 - 20

3x = 18

x = 6

Verification : 20 + 18 = 40 - 2.

- - - > 38 = 38

11 + x / 6 - 8 = √25

66 + x - 48 / 6 = 5

18 + x = 30

x = 12

Verification : 11 + 12 / 6 - 8 = √25

11 + 2 - 8 = 5

13 - 8 = 5

5 = 5

9(x - 7) = 3²

9x - 63 = 9

9x = 72

X = 8

Verification : 9(8 - 7) = 9 - > 9(1) = 9

(X + 3) / 2 = ✓64

(X + 3) / 2 = 8

X + 3 = 16

x = 13

Verification : (13 + 3) / 2 = √64

16 / 2 = 8

8 = 8.