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= 4/30 - 15/30 + 9/30
= -11/30 + 9/30
= -2/30
= - 1/15
b) 3/7 + 4/21 - 13/14
= 18/42+ 8/42 - 39/42
= 26/42 - 39/42
= - 13/42
= -1/3