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8(9)5
7(15)2
9(x)7
→ 8-5=3 × 3 = 9 ⇒ Cumple
→7-2=5×3=15 ⇒Cumple
→9-7=2×3=6 ⇒ x
Rpta: El valor de la incognita(x) es 6.