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-5-9=-14
1-9=-8
3-9=-6
-9-9=-18
9-9=0
17-9=8
7-(-12)=7+12=19
12-(-12)=12+12=24
0-(-12)=0+12=12
-6-(-12)=-6+12=6
-10-(-12)=-10+12=2
-20-(-12)=-20+12=-8
-35-(-12)=-35+12=-23
-1-9=-10
-5-9=-14
1-9=-8
3-9=-6
-9-9=-18
9-9=0
17-9=8
b)
7-(-12)=19
12-(-12)=24
0-(-12)=12
-6-(-12)=6
-10-(-12)=2
-20-(-12)=-8
-35-(-12)=-23