Negative Numbers: Adding and Subtracting

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(-9) - (-13)
Answer = 4
negative-numbers-adding-and-subtracting
0
8 + (-8)
Answer = 0
negative-numbers-adding-and-subtracting
1
(-13) - 7
Answer = -20
negative-numbers-adding-and-subtracting
2
(-5) - (-13)
Answer = 8
negative-numbers-adding-and-subtracting
3
(-12) + 1
Answer = -11
negative-numbers-adding-and-subtracting
4
(-15) - 7
Answer = -22
negative-numbers-adding-and-subtracting
5