To simplify the expression \( \frac{8x^8 - 8x^2 - 28x}{4x} \), we can start by factoring out the common term in the numerator.
- We can factor out \( 4x \) from the numerator:
\[ 8x^8 - 8x^2 - 28x = 4x(2x^7 - 2x - 7) \]
- Now, we can rewrite the entire expression:
\[ \frac{8x^8 - 8x^2 - 28x}{4x} = \frac{4x(2x^7 - 2x - 7)}{4x} \]
- Notice that \( 4x \) in the numerator and denominator cancels out:
\[ = 2x^7 - 2x - 7 \quad \text{(assuming } x \neq 0\text{)} \]
So the simplified expression is:
\[ \boxed{2x^7 - 2x - 7} \]