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"El doble del consecutivo de un numero" me suena a
2(x + 1)
"Disminuido en 3":
2(x + 1) - 3
"Da por resultado la raiz cuadrada de 81" (9):
2(x + 1) - 3 = 9
2x + 2 - 3 = 9
2x = 9 + 1
2x = 10
x = 5