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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+3x3:9
6+9:9
=7
   Bafta!!
6+3x[18:3-3x(12:3-3)]:9=
6+3 x [ 18:3-3 x ( 4-3)] :9=
6+3 x (18 :3 -3 x1) :9=
6+3 x ( 6-3) : 9 =
6+3 x 3 :9=
6+9:9
6+1=7