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2.|4-9|=5 D
3.|-4-5|=9 B
4.|5+8|=13 A
5.|-9+3|=6 F
6.|-3+3|=0 C
A.|-6-7|
B.|-2-7|
C.|10-10|
D.|20-15|
E.|3-2|
F.|-2-4|