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x² - 12x = - 36
x² - 12x + 36 = 0 Factorizas trinomio al cuadrado perfecto
(x - 6)² = 0 Tiene como solucion 2 raices reales iguales
(x - 6)(x - 6) = 0
x - 6 = 0
x = 6
Solucion,
x = 6