What does 负负得正 (fù fù dé zhèng) mean in English?

Card 83NPCR Level 5683/108
CARD83
PROGRESS77%
负负得正
負負得正
fù fù dé zhèng
a negatice number multiplied by another negative number makes the product positive
Click to reveal
← Previous↑ DeckNext →

Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d