same-r-value-is-used-for-two-different-addresses

[Minase]

interesting topic
i have tried the following formula k = (z1 + r1*x1)/s1 but something is quite wrong with my calculations
everything is ok with (Z + R*X) but when i do the division with S the result is a very small number.
should i do another operation? mod inv? thanks
//edit
nvm found my error 

[whanau]

i have checked this old post
https://bitcoin.stackexchange.com/questions/37673/same-r-value-is-used-for-two-different-addresses-finding-z1-and-z2-value-and-pr
and have recovered privatekey 1 and privatekey 2

Please could you explain how you recovered these keys. Like the OP in the link above, I get the same wrong answer.

I don't understand where all the extra inputs come from in the diagram (I am no mathematician!).
I can see the first 3 items in the diagram relate to the public keys and R values in the OP but where do the rest come from?
Thank you