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-5-9=-14
1-9=-8
3-9= -6
-9 -9=-18
9-9=0
17-9 =8
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7-12= -5
12 -12=0
0-12=-12
-6-12=-18
-10-12=-22
-20-12=-32
-35-12 =-47
b) -5,0,-12,-18,-22,-32,-47