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23 - {9x3} - {4x2}
23 - 27- 8
23 - 35
-12
================
23 - (27:3 ×3) - (12 : 3 ×2)
23 - (9 × 3) - (4 × 2)
23 - 27 - 8
-4 - 8
-12 ===> Respuesta
Espero que te ayude.
Saludos!!