What is the vertex of the parabola $f (x) = - 2 x^{2} + 8 x - 3$ ?

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If $3 x - 5 = 2 (x + 4) - 7$ , what is the value of $x$ ?
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If $\frac{2}{x - 3} = \frac{4}{2 x + 1}$ , what is the value of $x$ ?