Help me. решите уравнения 1.(х-4): 5=7 2.(х-3): 2=12 3. (х-9)3=12

1.
(x - 4) : 5 = 7

x -4 /5 = 7

x - 4 = 35

x = 35 + 4

x = 39

2.
(x - 3) : 2 = 12

x - 3 /2 = 12

x - 3 = 24

x = 24 + 3

x = 27

3.
(x - 9) : 3 = 12

x - 9 /3 = 12

x - 9 = 36

x = 36 + 9

x = 45

или ⇓ или

(x - 9) * 3 = 12

3x - 27 = 12

3x = 12 + 27

3x = 39

x = 13