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[(64x33x2:4-500x2):2+5xA]-6x12+999:9=112 Cu demonstrare!!

Răspuns :

[(2112x2:4-1000):2+5A}-72+111=112 
 [(4224:4-1000):2+5A]-72+111=112
[(1056-1000):2+5A]+39=112
56:2+5A+39=112
28+5A+39=112
67+5A=112
5A=112-67
5A=45
A=45:5
A=9
 Daca ai nevoie de explicatii , spune-mi.