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(2xz+z^2)+(z^2-y^2)=
z(2x+z)-(-z^2+y^2)=
z(2x+z)-(y^2-z^2)=
z(2x-z)-(y-z)(y+z)=
Suma de los factores:
z+(2x-z)-(y-z)+(y+z)=
z+2x-z-y+z+y+z=
2x+2z
La solucion es la D)
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