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a)
15-10=5
15-(-10)=25
-15-10=-25
-15-(-10)=-5
b)
-13-12=-25
-13-(-12)=-1
13-12=1
13-(-12)=25
c)
3.75-5=-1.25
3.75-(-5)=8.75
-3.75-5=-8.75
-3.75-(-5)=1.25
20
a)
-66-44=-110
45-54=-9
b)
-9-(-54)=45
-123-333=-456
c)
89-(-311)=400
-7.5-(-3)=-4.5