Since 1 Belarusian Ruble is equal to 4.71315398539417e-05 Euros, we could say that n Belarusian Rubles are equal to 4.71315398539417e-05 times n Euros. In other words, we could use the following formula:
Euros = Belarusian Rubles x 4.71315398539417e-05
For example, let's say that we want to convert 2.0 Belarusian Rubles to Euros. Then, we just replace Belarusian Rubles in the abovementioned formula with 2.0:
Euros = 2.0 x 4.71315398539417e-05
That is, 2.0 Belarusian Rubles are equal to 9.42630797078834e-05 Euros.