If I going to translate the book 6 pages per day I translate it 4 days earlier than if I translated 5 pages a day. If I translate 4 pages a day I translate it for how many days.....?

Correct result:

x =  30


s/5 = s/6+4
x = s/4

s = 120
s-4x = 0

s = 120
x = 30

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