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b=(a-1)
c=-2a
p+q=-b/a=-(a-1)/a
p.q=c/a=(-2a)/a=-2
p+q=2pq
-a+1/a=2(-2)
-a+1=-4a
4a-a=-1
3a=-1
a=-1/3
p.q=c/a=(-2a)/a=-2
p+q=2pq
-a+1/a=2(-2)
-a+1=-4a
4a-a=-1
3a=-1
a=-1/3