Convert string with expression to decimal

I have a table which has a column 'Faktor' (varchar(50)) which contains expressions like:

1/3
 2*9/5
 0.567
 0.23
 

No, I am searching a way to execute a select like

select Faktor from Artikel
 

which should return a column of type decimal with the values

0.333333
 3.6
 0.567
 0.23
 

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