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812-4x6{6x(61-3600:12:30)}:9

Răspuns :

812-4×6{6×(61-300:30)}:9=
=812-4×6{6×(61-10)}:9=
=812-4×6(6×51):9=
=812-4×6×306:9=
=812-4×6×34=
=812-4×204=
=812-816= -4