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Solve problem

I have a Solve[...] which gives me solutions like
{{b1 -> -2, a1 -> -1 }, {b1 -> 0.5, a1 -> 3}}
or like
{{a1 -> 1, b1 -> 3}}

How can I get the positive value for a1, which is  3
in the first case and  1  in the second one?


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