-2 7/9 : 1 5/6 - 1,6 - (-0,3)

1. Convert mixed numbers and decimals to fractions: -25/9 : 11/6 - 16/10 + 3/10

2. Perform division: -25/9 * 6/11 - 13/10 = -150/99 - 13/10

3. Perform subtraction: -50/33 - 13/10 = (-500 - 429)/330 = -929/330

-929/330