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e) 8/9-4:16-10/12 = 32/36 - 9/36 - 30/36 = - 7/36
f) (14*81-17/21) :8/3 = (1134 - 17/21) * 3/8 = (23814/21 - 17/21) * 3/8 = 23797/21 * 3/8 = 23797/56 = 424 53/56