1. 0 - (+9)
= 0 - 9
= -9
2. (-7) - (-5)
= (-7) + 5
= -2
3. (-10) - (+10)
= (-10) - 10
= -20
4. 15 - (-30)
= 15 + 30
= 45
5. (-8) - (+90)
= (-8) - 90
= -98
6. 8 - 0
= 8
7. 2 - 2
= 0
8. 80 - 18
= 62
9. -23 - 7
= -30
10. 8 - 20
= -12
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1. 0 - (+9)
= 0 - 9
= -9
2. (-7) - (-5)
= (-7) + 5
= -2
3. (-10) - (+10)
= (-10) - 10
= -20
4. 15 - (-30)
= 15 + 30
= 45
5. (-8) - (+90)
= (-8) - 90
= -98
6. 8 - 0
= 8
7. 2 - 2
= 0
8. 80 - 18
= 62
9. -23 - 7
= -30
10. 8 - 20
= -12