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18-23=-5
-18-23=-41
b 30-(-12)= 30+12=42
-23+(-18)=-41
-12-30=-42
c 23-18=5
-30-12=-42
12-30=-18
d -12-(-30)=-12+30=18
12-(-30)=12+30=42
-30-(-12)=-30+12=-18