In addition shown below, each of the letters A, B, C, D, and E represents one of the digits from 1 up to 5 (equal letters represent equal digits and different letters represent different digits). The first and last digits of the sum are given.

```
ABCDE
DABEC
EAABC
ACDAE
----- +
9CBA0
```

Correct explanation is in each image lower cell is half of sum of upper two cells. So x=(4+2)/2=3