What kind of a Triangle is this???

Level pending

Let ABC be a triangle such that \(\angle\) ACB=\(\pi\)/6 and let a,b,c denote the lengths of the sides opposite to A,B and C respectively. The value of x for which

a=\(x^{2}+x+1\)

b=\(x^{2}-1\)

c=\(2x+1\)

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