13/18-14/15
Let's calculate: 1318 -1415
13×5 -14×618×5
ℹ13×5 = 65‖-14×6 = -84‖18×5 = 90
65 -8490
ℹ65 -84 = -19
▶Result:   -1990
The numeric value of: -1990 is:
▷ ≈ -0.2111