-10a + 5a2 / -5a

Sure, let's solve this step by step:

1. First, let's simplify the expression by dividing 5a^2 by -5a.

   5a^2 / -5a = -a

2. Now, substitute this back into the original equation:

   -10a + (-a)

3. Finally, combine like terms:

   -10a - a = -11a

So, the simplified form of the expression "-10a + 5a^2 / -5a" is "-11a".