In this task, you need to translate the given English sentence to Polish language.

If x is an arbitrary member of Rn, Let me write like this. 
Jeżeli x jest dowolnym elementem Rn -- zapiszę to tak. 

so this, this right here is going to simplify 
więc to tutaj upraszcza się 

where you have multiple transactions that are listed in that page of the ledger. 

na której zapisana jest pewna liczba transakcji.