i) 6 from 18
18 - 6 = 12
ii) -13 from (-7)
- 7 - (-13) = -7 + 13
= 6
iii) -8 from 15
15 - (-8) = 15 + 8
= 23
iv) 5 from -8​
- 8 - 5 = -13
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