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b) -10-7+7-18=-28
c)-5/9 +2/3 +5/9 - 5/6 - 2/3 = -5/6
d) -2/7 +3/8 - 1/2 +2/7 - 1/4 + 1/2 = 1/8
e) -1,1 + 2,2 + 3,3 - 5,5 + 6,6 = 5,5