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400+480:4-(680:2:10+4*20:8)=

Răspuns :

=400+480:4-(340:10+80:8)=
=400+480:4-(34+10)=
=400+480:4-44=
=400+120-44=
=520-44=
=476
400+120-(34+10)=400+120-44=520-44=476