Having 4 legendary quality modules of level 3 in each machine you get the following:

10 Spent uranium fuel elements are converted into 15 uranium-238
From 80 uranium-235 and 10 uranium-238 you get 85 uranium-235 and 4 uranium-238 (6 uranium-238 produces 5 uranium-235 if you put the output back to the input)
From 19 uranium-238, 10 iron plates and 1 uranium-235, 25 uranium fuel elements are obtained.
One uranium fuel element conventionally produces 1 unit of energy and 1 spent uranium fuel element.

and it turns out that:
From 20,2 uranium-238 and 10 iron plates 25 uranium fuel elements are obtained.

and
1 Spent uranium fuel element /10x15=1,5 uranium-238
20,2 uranium-238 /20.2x25= 25 uranium fuel elements
1 uranium fuel element produces 1 unit of energy and 1 spent uranium fuel element

and it turns out that
1 Spent uranium fuel element /10x15/20,2x25= 375/202 spent uranium fuel elements and 375/202 unit of energy (ignoring the iron plates)
subtract 1 Spent uranium fuel element from both sides and we get
0= 173/202 uranium fuel elements and 375/202 unit of energy (ignoring the iron plates)

and we just got energy and uranium from just iron plates