John read the book so that it read 30 pages per day. Maxim read 34 pages a day and read it two days earlier than John. How many pages has the book?

Correct result:

n =  510


n=30 2 34/(3430)=510

n = 30 d; n = 34 ( d-2)

n = 30•d
n = 34•( d-2)

30d-n = 0
34d-n = 68

d = 17
n = 510

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