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[(64×33×2:4-500×2):2+5×a]-6×12+999:9=112

Răspuns :

[(1056-1000):2+5a]-72+111=112
(56:2+5a)-72+111=112
28+5a-72+111=112
5a=112-28+72-111
5a=84+72-111
5a=156-111
5a=45
a=45:5
a=9