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Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 6 | . | 5 | |
| 0 | . | 7 | |
| - | 1 | . | 9 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the tenths column is too small to get a positive difference, borrow 2 from the digit (6) in the next number place which becomes (4) and get (25).
| Place value | ones | . | tenths |
| 4 | 25 | ||
| 6 | . | 5 | |
| 0 | . | 7 | |
| - | 1 | . | 9 |
| . |
Subtract the numbers in the tenths column from the top number:
25-7-9=9
| Place value | ones | . | tenths |
| 4 | 25 | ||
| 6 | . | 5 | |
| 0 | . | 7 | |
| - | 1 | . | 9 |
| . | 9 |
Subtract the numbers in the ones column from the top number:
4-0-1=3
| Place value | ones | . | tenths |
| 4 | 25 | ||
| 6 | . | 5 | |
| 0 | . | 7 | |
| - | 1 | . | 9 |
| 3 | . | 9 |
The solution is: 3.9
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