A) -3/4-2/7+-1/4+3/4-5/7 B) -2/17+15/23+15/17+1/9+8/23 C) 7/19x8/11+-12/19+3/11x7/19 D) 5/9x7/13+5/9x9/13-5/9x3/13 E) -11/23x6/7+15/17x-11/23-11/23 F) (377/-231-123/89+34/791)x(1/6-1/8-1/24)

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