Bonjour
10/- 12 = - 5/6 car 10/- 12 = (2 x - 5) / (2 x 6)
= - 25/30 car (- 5 x 5) / (6 x 5)
= 45/- 54 car (- 5 x 9) / (6 x 9)
= - 15/18 car (- 5 x 3) / (6 x 3).
