If the odds offered on a particular selection are -110, that means in order to 'win' (profit)R$100, you would need to wagerR$110. If the odds are +110, it means that if you wageredR$100, you would 'win' (profit)R$110.
Odds with a negative (-) symbol indicate the betting favorite. The number that follows the negative symbol (the odds) reveals how much to bet for everyR$100 you want to win. For example, as explained above, if the team you're betting has -110 odds, you need to wagerR$110 to winR$100.