If \( y=2 x-3 \) is a tangent to the parabola \( \mathrm{P} \) \( y...

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If \( y=2 x-3 \) is a tangent to the parabola
\( \mathrm{P} \) \( y^{2}=4 a\left(x-\frac{1}{3}\right) \), then \( a \) is equal to:

W
(1) 1
(2) -1
(3) \( \frac{14}{3} \)
(4) \( \frac{-14}{3} \)
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