Solve 9x 2 -3(a+b)x+ab=0
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9x2-3ax-3bx+ab=0
3x(3x-a)-b(3x-a)=0
(3x-a)(3x-b)=0
therefore
3x-a=0 or 3x-b=0
x=a/3 or x=b/3
3x(3x-a)-b(3x-a)=0
(3x-a)(3x-b)=0
therefore
3x-a=0 or 3x-b=0
x=a/3 or x=b/3
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