Write as a single fraction in its simplest form $\displaystyle \frac{-4}{x^2-4} + \frac{1}{x-2}$. Answer ...

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1. 1Factorise completely $9b^{2} - 6ab + a^{2} - x^{2}$. Simplify $\dfrac{5}{2x^{2} - 7x - 4} - \dfrac{8}{4 - x}$.
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