$$\(19 a=\frac{14}{3 x-7} \quad x=\frac{7}{4 y-3}\)$$ Express $$\(a\)$$ in the form $$\(\frac{p y+q}{r y+s}\)$$ where $$\(p, q, r\)$$ and $$\(s\)$$ are integers. Give your answer in its simplest form. $$\[ a= \]$$

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