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7-15=-8
(-1)-9=-10
(-2)-5=-7
(-4)+19=15
(-4)-(-19)=15
(-4)+(-19)=-23
(-8)-(-2)=-6
12+ 3=15
-8
-10
-7
15
15
-23
-6
15
7-15= -8
(-1)-9= -10
(-2)-5= -7
(-4)+19= 15
(-4)-(-19)= 15
(-4)+(-19)= -23
(-8)-(-2)= -6
12+ 3= 15