simplify
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(b) 2/3*7/4 + 7/5 - 3/7*6/11 = 7/6 + 7/5-18/77= 77/30 -18/77 = 6469/2310
(c) 4/5*9/13+6/11- 3/2*1/5 = 36/65+6/11-3/10 = 786/715-3/10 = (7860-2145)/7150 = 1143/1430
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