Let X be the number of pages Susan read yesterday.
Today Susan read X/3 - 8 = 17.
Therefore X/3 = 25.
Thus, Susan read X = 75 pages yesterday. Answer: \boxed{75}.
Susan read 17 pages today. That is 8 pages fewer than 1 over 3 of the pages she read yesterday. How many pages did she read yesterday?
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