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a fost răspuns

3+3x[3+3x(3+3x3)]=(3xa+3)x3+3

Răspuns :

3+3*(3+3*12)=(3*a+3)*3+3
3+3*39=(3*a+3)*3+3
(3*a+3)*3+3=120
3*a+3=(120-3):3
3*a=117:3-3
a=(39-3):3
a=36:3. a=12