Subtract 4-digit numbers (Column)

Find the difference of the numbers below. Use regrouping where necessary.

1) Solve
8669
-3640
2) Solve
7776
-7024
3) Solve
8894
-8721
4) Solve
8191
-3359
5) Solve
9453
-8037
6) Solve
7709
-2653
7) Solve
1693
-1442
8) Solve
6741
-5374
9) Solve
9237
-7272
10) Solve
8874
-3567
11) Solve
9128
-7319
12) Solve
5369
-1928
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