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-15 +16
+1
-3-2-10+5+3+8
-15+16=1
b) -5 + (-1) + 4 + (-12) + 3 + (-7)
-5-1-12-7+4+3
-25+7=-18
c) 9 + (-11) + (-4) + 6 + (-3)
-11-4-3+9+6
-18+15=-3
d) -6 +4 + (-3) + (-11) + 9 +8
-6-3-11+4+9+8
-20+21=1