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7-[18-17+2]=
7-[1+2]=
7-3=4
∨
7 - [ 2 × 9 - 17 + 4 ÷ 2 ] =
∨
7- [ 18 - 17 + 4 ÷ 2 ] =
∨
7 - [18 - 17 + 2 ] =
∨
7 - [ 1 + 2 ] =
∨
7 - 3 =
∨
4
Respuesta = 4