Question

l f l - 2/3=5/6

Answer 1

If you are solving for f:

f=5/6+2/3
f=5/6+4/6
f=9/6=3/2=1.5

Answer 2

I f I =5/6 +2/3 =(5+4)/6 =9/6 =3/2
I f I = 3/2
f=3/2
f=-3/2