-2a^2+a+6 - -3a^2+2a-5

First, let's simplify the parentheses:

-2a^2 + a + 6 - -3a^2 + 2a - 5

Next, let's group like terms together:

(-2a^2 - 3a^2) + (a + 2a) + (6 - 5)

Simplifying further:

-5a^2 + 3a + 1