Question

(b-c)x2+(c-a)x+(a-b)=0

Answer 1

(b-c)*2+(c-a)x+(a-b)=0
2b-2c+xc-ax+a-b=0
b-2c+xc-ax+a=0
b=2c-xc+ax-a

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Answer 2

     2(b-c)+(c-a)x+(a-b)=0
⇒  2b-2c+xc-ax+a-b=0
⇒  b-2c+xc-ax+a=0
⇒  b=2c-xc+ax-a