9+3 (5 - a) - 7a.

Answer 1

Let's simplify the expression step by step:

9 + 3(5 - a) - 7a
= 9 + 15 - 3a - 7a
= 24 - 10a

Therefore, 9 + 3(5 - a) - 7a simplifies to 24 - 10a.