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5+3*{6-2*[2-8:(4+2*a)]}:6=7



Răspuns :

5+3x{6-2x[2-8:(4+2a)]}=7x6=42
3x{6-2x[2-8:(4+2a)]}=42-5=37
6-2x[2-8:(4+2a)]=37:3