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10. Calculate the difference of two integers

1. \((-4)\) \(-\) \((-63)\) \(=\)

2. \((-27)\) \(-\) 40 \(=\)

3. 80 \(-\) \((-10)\) \(=\)

4. 60 \(-\) 23 \(=\)

[Note: Insert minus sign if your answer is in negative]

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