To solve this equation, we first need to distribute the 1/3 to both terms inside the parentheses:

(х + 5/2):3/8 -1,125 = 227/8

Next, we want to simplify the expression inside the parentheses:

(8(х + 5/2)):3 -1,125 = 227/8

8х + 20/2 -1,125 = 227/8

Now, combine like terms:

8х + 10 -1,125 = 227/8

8х -1,115 = 227/8

Next, we want to isolate the variable х by adding 1,115 to both sides of the equation:

8х = 227/8 + 1,125

8х = 227/8 + 9.0

8х = 227/8 + 72/8

8х = 299/8

Finally, we solve for х by dividing both sides of the equation by 8:

х = (299/8) / 8

х = 299/64

Therefore, the solution to the equation is х = 299/64.