The simplified expression is
removing negative exponents and combining like terms from the given expression

It seems there might be a typo in the expression you provided. It looks like there's a space between "-12a-³" and "6-7." If that's intentional, please clarify. Assuming it's a typo, I'll simplify the expression without considering the space.
The given expression is: -12a⁻³ - 6 - 7
To simplify this expression, combine like terms:
-12a⁻³ - 6 - 7 = -12a⁻³ - 13
Now, to remove negative exponents, you can rewrite the expression as:
-12 / a³ - 13
So, the simplified expression without negative exponents is:
