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Without an equality sign it is no kind of an equation at all.
It is often possible to find an explicit formula that gives the same answer as a given recursive formula - and vice versa. I don't think you can always find an explicit formula that gives the same answer.
You can search on ebay or more likey to find at Staples :)
The term recursive refers to the recurrence or repetition.
A recursive rule is one which can be applied over and over again to its own output