The conjugate of `(2sqrta - b)` is `(2sqrta + b)` and we multiply top and bottom of the fraction by this conjugate.

`frac{6sqrta}{2sqrta - b}`

`=frac{6sqrta}{2sqrta - b} times frac{2sqrta + b}{2sqrta + b}`

`=frac{12a+6bsqrta}{4a - b^2}`

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