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QR Challenge: Working With Negative Numbers

Question	Answer
8 - 10	-2
4 - 8	-4
-1 + 9	10
-4 - 10	-14
-7 + 14	7
11 - 14	-4
-4 - 9	-13
3 - 9	-6
-3 + 8	5
13 - 20	-7
7 - 10	-3
16 - 16	0
9 - 15	6
1 - 15	-14
-7 + 10	3
-5 + 20	15