Which one?

1/x, first choice

Step-by-step explanation:

$\frac{x^3}{x^{-1}*x^5}$ = $\frac{1}{x^{-1}*x^2}$ =1/x

given the equation is 8+9z=-6, the first step would be to subtract the 8 from both sides:

8+9z-8=-6-8

since 8 minus 8 = 0, this would cancel out the 8. and since -6 minus 8 equals -14, the equation would look like this

9z = -14