Find A - B


A = [ 3 7 8 ] B = [ 2 2 6 ]
7 9 3 6 7 8
7 9 9 5 8 6

do you mean?

| 3 7 8 | | 2 2 6 |
| 7 9 3 |-| 6 7 8 |
| 7 9 9 | | 5 8 6 |
is
| 1 5 2 |
| 1 2-5 |
| 2 1 3 |