To solve this equation, we need to isolate the variable x.

First, we simplify the left side of the equation:
(5x + 3,5) / 3 = 1 4/5
(5x + 3.5) = 3 1 + 3 4/5
5x + 3.5 = 3 + 12/5
5x + 3.5 = 3 + 2.4
5x + 3.5 = 5.4

Next, we subtract 3.5 from both sides to isolate x:
5x = 5.4 - 3.5
5x = 1.9

Finally, we divide by 5 to solve for x:
x = 1.9 / 5
x = 0.38

Therefore, the solution to the equation is x = 0.38.