To solve this, we need to first multiply 5/6 by 2 and then subtract the result from 4/5.

5/6 * 2 = 10/6 = 5/3

Now subtract 5/3 from 4/5:

4/5 - 5/3

To subtract these fractions, we need to find a common denominator:

4/5 = 12/15
5/3 = 25/15

Now we can subtract:

12/15 - 25/15 = -13/15

Therefore, the result of -5/6 * 2 + 4/5 is -13/15.