The given mathematical expression in the image appears to be:

$\frac{3x^{-2} + (2x - 1)^{-2}}{6}$

It seems like you have worked on simplifying or differentiating the expression.

Would you like me to:

1. Simplify the given expression?
2. Differentiate it?
3. Solve for $x$ if given an equation?
4. Explain step-by-step?
5. Verify if your work is correct?

Here’s a quick tip: When working with negative exponents, rewrite them as fractions to make the expressions easier to manipulate.