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Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 7 | 8 | 4 | |
| - | 6 | 4 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
4-4=0
| Place value | hundreds | tens | ones |
| 7 | 8 | 4 | |
| - | 6 | 4 | |
| 0 |
Subtract the numbers in the tens column from the top number:
8-6=2
| Place value | hundreds | tens | ones |
| 7 | 8 | 4 | |
| - | 6 | 4 | |
| 2 | 0 |
Write 7 in the hundreds place.
| Place value | hundreds | tens | ones |
| 7 | 8 | 4 | |
| - | 6 | 4 | |
| 7 | 2 | 0 |
The solution is: 720
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