Errand Chronicle 31011 · Entry #3

Pyresh's Formula III

Objective
Found a trace of Pyresh. Let's solve Pyresh's Formula written on it.

Solve the secret formula left behind by Pyresh and type it in the chat window;
Dialogue
Trace of Pyresh Dialogue
Pyresh left behind a piece of his realizations.
Numbers are written in what looks to be a riddle of sorts.
After a sequence of numbers follows a question mark.
It's as if someone wanted their formula to be solved by another.
3□ 3 □ 3 □ 7 = 7
Find the number or symbol that fits inside each □. You may need more than one number or symbol to make the formula work. Type the answer without spaces.
Trace of Pyresh Dialogue (Alt)
3□3 □ 3□7 = 7
Find the number or symbol that fits inside each □. You may need more than one number or symbol to make the formula work. Type the answer without spaces.
Trace of Pyresh Completion
3□3 □ 3□7 = 7
3.3 + 3.7 = 7
The answer was .+.
You've solved Pyresh's Formula.
Other Errands in This Chronicle

9 further errands share this chronicle — the same travelers, the same stretch of road.

Details
Chronicle31011
Entry3
Quest Giver
Turn-in
Summary
3□3 □ 3□7 = 7
3.3 + 3.7 = 7
The answer was .+.
You've solved Pyresh's Formula.