3/4-13/14
Let's calculate: 34 -1314
3×7 -13×24×7
ℹ3×7 = 21‖-13×2 = -26‖4×7 = 28
21 -2628
ℹ21 -26 = -5
▶Result:   -528
The approximate value of: -528 is:
▷ ≈ -0.1786