What you are trying to do is non-relational, and will only work when you
put the non-relational pluso at the end.

You can obviously use the finite domain extensions to core.logic to
accomplish this:

(defn fd-pluso [t1 t2 s]
  (fd/eq (= s (+ t1 t2))))

(run* [q]
  (fresh [a]
    (fd/in q a (fd/interval Integer/MAX_VALUE))
    (fd-pluso q 4 a)
    (== a 7)))

=> (3)

I don't know how you achieve this result in core.logic without the finite
domain support.

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