This is a fun puzzle sadly, considering its basic mathematics. You can overlay each mathematic equation on the edges to see what number combinations you can use. There is a time limit, so I suggest you either head for solid numbers first, so you have a better idea of what really 'needs' to go somewhere, and in what order to place them- or you're going to end up doing a lot of backtracking. The interface isn't too convenient either, kind of like defusing a bomb with few seconds to spare, and finding out their using shielded coax as opposed to those little wires that everyone cuts with .5 seconds remaining.
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