ax−a+bx−b=2cx−c
a(x−b)+b(x−a)(x−a)(x−b)=2cx−c
a(x−b)(x−c)+b(x−a)(x−c)=2c(x−a)(x−b)
a(x2−cx−bx+bc)+b(x2−cx−ax+ac)=2c(x2−bx−ax+ab)
ax2−acx−abx+abc+bx2−bcx−abx+abc
−2cx2−2bcx−2acx+2abx
ax2+bx2−2cx2+acx−2abx+bcx+2abc=−2bcx+2abc
(a+b−2c)x2+acx+bcx−2abx=0
x((a+b−2c)x+(ac+bc−2ab))=0
x=0, (a+b−2c)x+(ac+bc−2ab)=0
x=0, x=2ab−ac−bca+b−2c.
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