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25-{27:[(36-27:3):3]+42:7×3}

Răspuns :

=25-{27:[(36-9):3]+42:7×3}=
=25-{27:[27:3]+42:7×3}=
=25-(27:9+42:7×3)=
=25-3+6×3=
=25-3+18=
=22+18=
=40
Sper că e corect!