A plus (+) represents longer odds, in which case you'll win more for your wager, while a minus (-) means you're betting on a more likely outcome (as deemed by the sportsbook) and will win less when you emerge victorious. For example,R$100 on +110 odds wins youR$110, whileR$110 on -110 odds wins youR$100.
Odds with a plus sign are underdog bets. Plus odds tell you how much profit you will get on aR$100 bet. AR$100 bet with +200 odds nets you $200 profit plus your originalR$100 bet. If you betR$20, you would profitR$40. For the rare even money odds, those can be listed as -100, +100 or EV.