simplify the expression
This depends on what your teacher wants. If they are wanting it expanded then simply multiply both terms by 9. Other than that possibility, that only thing u can do to further simplify this expression is to factor out the negative from the term inside the parenthesis. This would become
-9(9d-19)
Some consider a negative sign in front of the highest order term in a polynomial to not be simplified. You cant take any further factors from the inside term because 19 is a prime number.