4/15-13/20
Let's calculate: 415 -1320
4×4 -13×315×4
ℹ4×4 = 16‖-13×3 = -39‖15×4 = 60
16 -3960
ℹ16 -39 = -23
▶Result:   -2360
The numeric value of: -2360 is:
▷ ≈ -0.3833