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b) 6 + 27 + (-27) = 6 + 0 = 6
c) 4 + 13 + (-13) = 4 + 0 = 4
d) 46 + (-64) = (-18)
e) 14 + 31 + (-31) = 14 + 0 = 14
f) 88 + (-108) = (-20)