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Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 5 | 7 | |
| - | 1 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
7-1=6
| Place value | tens | ones |
| 5 | 7 | |
| - | 1 | |
| 6 |
Write 5 in the tens place.
| Place value | tens | ones |
| 5 | 7 | |
| - | 1 | |
| 5 | 6 |
The solution is: 56
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