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[(X+3) x 3 + 3 ] x 3 + 3 =102

Răspuns :

[(X+3) x 3 + 3 ] x 3 + 3 =102
[(X+3)x3+3]x3=102-3
[(X+3)x3+3]x3=99
(X+3)x3+3=99:3
(X+3)x3+3=33
(X+3)x3=33-3
(X+3)x3=30
X+3=30:3
X+3=10
X=10-3
X=7