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A random variable $X$ has probability density function $f(x)$ as given below:

$
f(x)= \begin{cases}
 a+bx & \\
 0 &
\end{cases}$  for $0 < x < 1$

otherwise

If the expected value $E[x] = 2/3$, then $Pr[x < 0..5]$ is __________.
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