(–7x – 5x4 + 5) – (–7x4 – 5 – 9x)
First, distribute the negative sign in front of the second parenthesis:
(-7x - 5x^4 + 5) + (7x^4 + 5 + 9x)
Now combine like terms:
= -5x^4 - 7x + 7x^4 + 9x + 5 + 5
= 2x^4 + 2x + 10
Therefore, the simplified expression is 2x^4 + 2x + 10.