See (6.74). I believe this is a type as I got this constraint to be
$$ \pi_1 + \pi_3 = -1 $$
Yes, it is a typo.
You have written down the constraint correctly, they can be read off as the coefficient of $x_3$ in the maximization problem.
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Yes, it is a typo.
You have written down the constraint correctly, they can be read off as the coefficient of $x_3$ in the maximization problem.