Let x be the number of pages Susan read yesterday.
Susan read x * (1/3) - 8 = 17 pages today.
Thus, x * (1/3) = 25.
Therefore, Susan read x = 25 * 3 = <<75=75>>75 pages yesterday. 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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