Bonjour,
-3/(6/5) = -3 × 5/6 = -15/6 = -5/2
(-3/6)/5 = (-3/6) × (1/5) = -3/30 = -1/10
(-7/5)/(6+1/5) = (-7/5)/(30/5+1/5)
= (-7/5)/(31/5)
= (-7/5) × (5/31)
= -7/31