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-7-3=-10
-5+5=0
+2+8=+10
-4+9-6=-1
+10+3-15=-2
b) -7-3 = -10
c) -5+5 = 0
d) +2+8 = 10
e) -4+9-6 = -1
f) +10+3-15 = -2