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[(x+3)•3+3]•3+3=102 va rog

Răspuns :

[(x+3)•3+3]•3+3=102
[(x+3)•3+3]•3=99
[(x+3)•3+3]=33
(x+3)•3=30
x+3=30:3
x+3=10
x=7