If the spread is set at +7, the underdog must either win the game outright or lose by fewer than seven points in order to cover. For the favorite to cover, they must win by more than seven points.
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.