Like, if I have UNC +3 at -120 I can compare it with a no vig line if some sportsbook has -3 -110 vs +3 -110.
But if I have UNC +3 at -120 and that sportsbook has -2 -115 vs -2 -105, the same process doesn't work. So I'm wondering what the process would be if you can still calculate it.