Matchstick puzzle - 9 minus 6 is not equal to 4 - move 3 matchsticks to make the equation true

9 minus 6 is not equal to 4 - move 3 matchsticks to make the equation true
matchstick puzzle - 9-6=4 - there are four possible answers. getting one solution within 30 seconds makes you good. getting four solutions within three minutes makes you brilliant!