1. 9-1=8
have 9 owe 1 = have 8
+++++++++
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2. 6+(-7)=13
have 6 remove owe 7 = have 13
++++++ +++++++
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3. 8-(-2)=10
have 8 remove owe 2 = have 10
++++++++ ++
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4. 10+(-2)=8
have 10 and owe 2 = have 8
++++++++++
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5. 10-4=6
have 10 owe 4 = have 6
++++++++++
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6. (-8)+(-3)=(-11)
owe 8 and owe 3 = owe 11
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7. 0-5=(-5)
have 0 owe 5 = owe 5
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8. 8-4=4
have 8 owe 4 = have 4
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