Let X be the number of pages Susan read yesterday.
We know that (1/3)X - 8 = 17.
Thus, (1/3)X = 17 + 8 = 25.
Thus, X = 25 * 3 = <<25*3=75>>75. Answer: \boxed{75}.
Susan read 17 pages today. That is 8 pages fewer than 1/3 of the pages she read yesterday. How many pages did she read yesterday.
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