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6+3x[18:3-3x[12:3-3)]:9=


Răspuns :

6+3x[6-3x(4-3)]:9=
6+3x[6-3x1]:9=
6+3x(6-3):9=
6+3x3:9=
6+9:9=
6+1=7
6+3×(6-3×1):9=6+3×3:9=7