Striking off a digit from each of the numbers written in seven rows, while preserving arithmetical operations

Question

Problem

Strike off any digit from each number in seven rows (need not be at same place) and combine the same operations with 3 digit numbers to get the same addition. After this strike off another digit from all and add all the numbers to get the same 2 digit number perform the same. Process again with 1 digit Numbers. Give the numbers in 7 rows at each stage.

I got this from a Q bank, there was no answer.

   1 2 3 4

+ 3 4 5 5

----------

4 6 8 9

- 2 3 4 5

----------

2 3 4 4

+ 1 2 5 4

------------

3 6 9 8

My Solution got stuck

Solution 1

I just gone this much but got stuck here ....

1 2 3 +
3 4 5 
--------
4 6 8 -
2 3 4
-------
2 3 4 +
xxxxxxxx Stopped

Solution 2

1 2 4 +
3 4 5 
--------
4 6 9 -
2 3 5
-------
2 3 4 +
xxxxxxxx Stopped

Answer 1

1 3 4 +
3 5 5 
--------
4 8 9 -
2 4 5
-------
2 4 4 +
1 2 5
-------
3 6 9