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2x^2 - 4x - 6 = 0
dividiendo todo por 2
x^2 - 2x - 3 = 0
factorizando
(x - 3)(x + 1) = 0
x - 3 = 0
x1 = 3
x + 1 = 0
x2 = - 1
S = {- 1, 3}