Hi Guys,

I have a quick question regarding constraints in integer linear programming. I've never seen a constraint look something like this but I need it to complete my model.

(X1 + X2) / 9 > 0 and integer

Essentially meaning x1 + x2 modulo 9 needs to be 0. Would this be acceptable in linear programming because I have yet to see a constraint that divides numbers on the left side.