-4:2= -2
-12:2= -6
-8:2= -4
-6:2= -3
(-8 + 4) : 2 = -4 : 2 = -2
(-8 - 4) : 2 = -12 : 2 = -6
(-7 - 1) : 2 = -8 : 2 = -4
(-7 + 1) : 2 = -6 : 2 = -3
-4:2= -2
-12:2= -6
-8:2= -4
-6:2= -3
(-8 + 4) : 2 = -4 : 2 = -2
(-8 - 4) : 2 = -12 : 2 = -6
(-7 - 1) : 2 = -8 : 2 = -4
(-7 + 1) : 2 = -6 : 2 = -3