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783+200:10-[76+(293-e)]=643​

Răspuns :

783+200:10-[76+(293-e)]=643

paranteza o notam cu a

783+20-a=643

803-a=643

a= 803-643

a=160

76+(293-e)=160

293-e=160-76

293-e=84

e=293-84

e=209