Point $$\(A\)$$ has coordinates $$\((-3,11)\)$$ Point $$\(B\)$$ has coordinates $$\((47, b)\)$$ The midpoint of $$\(A B\)$$ has coordinates $$\((a,-19)\)$$ Find the value of $$\(a\)$$ and the value of $$\(b\)$$. $$\[ \begin{aligned} & a=. \\ & b=. \end{aligned} \]$$

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