how to reduce a fraction?

Question

I solved expression and saw this solving, but I didn't see the way to reduce one. $$\begin{align}\frac{a+2\sqrt{ab}-3b}{ab(a - \sqrt{ab} - 3\sqrt{ab -3b})}=\frac{1}{ab}\end{align}$$ Can you show me the way to reduce one?

Answer 1

The equality you wrote is obviously false, or at the very best, is not true for all values of $a,b$. For example, taking $a=b=1$ results in $0$ on the left hand side and $1$ on the right.