5.98x 10²⁴/3.84 x 10⁸ -x

To simplify the expression $\frac{5.98 \times 10^{24}}{3.84 \times 10^{8}} - x$:

1. Divide the coefficients: $\frac{5.98}{3.84} \approx 1.5583$.
2. Subtract the exponents: $10^{24 - 8} = 10^{16}$.
3. Combine the results: $1.5583 \times 10^{16} - x$.

So, the simplified expression is approximately $1.5583 \times 10^{16} - x$.