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x² + x² + 4x +4 = 340
2x² +4x -336=0
diviendo toda la ecuacion entre dos para reducir:
x² + 2x - 168=0
(x+14)(x-12)
x₁+14=0 x₂-12=0
x₁= -14 x₂= 12
solucion: {-14 y 12}