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25-{27:[(36-27:3):3]+42:7x3}

Răspuns :

(36-27:3)= 36-9=27
apoi paranteza patrata devine rotunda si acolada paranteza patrata
(27:3) =9
apoi "acolada" (paranteza patrata) devine paranteza rotunda
(27:9+42:7x3)=3+6x3=21

25-21=4