Basic difference for subtraction with two formula

By -
 Formula 1 :
                   387
                   -98
                  ------
                  289

1st step we borrow 1/(10) from 8 and then make 7 into 17. (17-8=9).
2nd step we add borrowed 1 with 9 and again borrow 1/(10) from 2. (18-10=8).
3rd step we subtract  borrowed 1 from 3. (3-1=2).

______________________________________________________________

Formula 2 :
                 387
                 -98
                ------
                289

1st step we borrow 1/(10) from 8 and then make 7 into 17. (17-8=9).
2nd step we subtract borrowed 1 from 8 then situation is (7-9) so we again
borrow 1/(10) from 2. (17-9=8).
3rd step we subtract  borrowed 1 from 3 and than (2-0=2).

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