To solve these expressions, we need to perform the operations step by step.

1. -1/9 - 3/5 + 5/-6
To add or subtract fractions, we need to have a common denominator. The common denominator for 9, 5, and 6 is 90. So, we rewrite the fractions with a common denominator:
-10/90 - 54/90 + 75/90
Now we can add the fractions:
-10/90 - 54/90 + 75/90 = 11/90

2. -3/5 - 7/2
To subtract fractions, we need a common denominator. The common denominator for 5 and 2 is 10. So, we rewrite the fractions with a common denominator:
-6/10 - 35/10
Now we can subtract the fractions:
-6/10 - 35/10 = -41/10

3. 3/5
This fraction is already in its simplest form.

Therefore, the final answer is:
11/90, -41/10, 3/5