If the roots of the equation (a-b)x²+(b-c)x+(c-a)=0 are equal,show the c,a and b are in AP

If the roots of the equation (a-b)x²+(b-c)x+(c-a)=0 are equal,show th

1.	If the roots of the equation (a-b)x²+(b-c)x+(c-a)=0 are equal,show the c,a and b are in AP
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