To solve this equation, we will first simplify each component.

(5 7/18 - 4 23/30) = (94/18 - 143/30)
= (470/90 - 429/90)
= 41/90

Next, we will simplify (1,12 1 1/9) = (1 + 12/100) (9/9 + 1/9)
= (1.12) (10/9)
= 1.12 1.11
= 1.2432

(5 1/2 - 3.25) = 5.5 - 3.25
= 2.25

(3,2 + 0,8(5 1/2-3,25)) = 3.2 + 0.8 2.25
= 3.2 + 1.8
= 5

Now, we can substitute our simplified values into the equation:

(41/90) / (1.2432) = x / 5
(41/90) / (1.2432) = x/ 5
(41/90) / (1.2432) = x/5
(41/90) / (1.2432) = x/5
0.4544 = x/5

To find the value of x, we multiply both sides by 5:

x = 0.4544 * 5
x = 2.272

Therefore, the value of x in the equation is approximately 2.272.