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-40+15=-25
18-38=-20
-90-10=-100
28+(-27)=1
-14-(-13)=-1
2: -40
3: -38
4: -90
5: 28
6: -13
...+15=-25 ... -40
18-...=-20 ... 38
...-10=-100 ... -90
...+(-27)=1 ... 28
-14-(-...)=-1 ... 13