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81 + x² = 18x
x² - 18x + 81 = 0 Factorizas trinomio al cuadrado perfecto.
(x - 9)² = 0 Tiene como solución dos raices reales iguales
(x - 9)(x - 9) = 0
x - 9 = 0
x = 9
Solución-
{ 9 }