Problem-solving in Galapagos

Hi dear friends
I am looking for a problem-solving in the Galapagos. But I will not succeed.
As you can see in the figure, for example, I want to find the values of X,Y,Z,U so that the answer to the equation (R) was 552. How can I do this? Of course, I also used the threshold option, but I realized that this option has another function.
Can anyone explain me? Thanks
gala.gh (8.9 KB)