-5,9 + (3 1/4 + 1 3/20) = -5,9 + (3 1/4) + (1 3/20)
= -5,9 + 3 + 1/4 + 1 + 3/20
= -2.9 + 4 + 0.25 + 1 + 0.15
= 1.4 + 0.25 + 0.15
= 1.8 + 0.4
= 2.2