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x^4=t^2
x^2=t
6t^2+5t+1=0
aplicas la ecuacion de 2º grado
x=-b+-raiz(b^2-4ac) / 2a
t1=-1/2 t2=-1/3
x^2=t
x=raiz(t)
la raiz de un nº negativo no tiene solucion.