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Benjamin: x
(x + 3)^2 + x^2 =317
x^2 +9 + 6x + x^2 = 317
2x^2 + 6x - 308=0 ahora haces aspa simple
2x -22
x 14
entonces 2x - 22 = 0
2x=22
x=11
(PD : x^2 es x al cuadrado)