Simplify the complex fraction: (1/a - 1/b) / (1 - ab)

✅ Correct.

The solution provided in the image correctly simplifies the complex fraction.

Explanation:
The steps shown accurately apply algebraic properties:

• Multiplicative Identity is used to express terms with a common denominator.
• The Golden Rule (multiplying numerator and denominator by the same non-zero value) is applied to find common denominators for the sub-fractions.
• The Distribution Law (factoring out the common denominator $\frac{1}{ab}$) is used to combine the terms in the numerator and denominator.
• Finally, the Cancellation Law is applied to cancel the common factor $\frac{1}{ab}$ from the main numerator and denominator, leading to the correct simplified form.

The final answer $\boxed{\frac{b-a}{ab-1}}$ is correct.