What is the measure of the wedged angle?

Can you solve this geometry puzzle? Thanks to Robson for the suggestion!

Polish translation credit: Tłumaczenie: Przemyslav
Znajdź mnie tutaj: https://forum.cdaction.pl/blogs/blog/64401-ma%C5%82a-wie%C5%9B-po%C5%9Brodku-niczego/

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