Ok so there might be a thing or two which might lead you to eventually leave some game, for example a death or leaving ur stove on and forgetting to shut it off, although dota is a life and death situation, leaving a game is wrong, unless you are wanted too. So therefore if you want to leave the game get the permission by your team members, tell them politely of whats going on state your reason clearly, be corteous, divide the gold and items equally, then only after then apologize to your opponent and stating the reason of why you want to quit the game. After everything is cleared up then only you can leave.

puuiiiiiiiii.... loser attitude. PUUUUUUIIIIIIIIIIIIIIIIIIIIIIII