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b/a=(b+6)/(a+3)
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b=2a

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4x=32
x=8

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(x-4)/(x-6)-(x-5)/(x-7)=(x-7)/(x-9)-(x-8)/(x-10)
-2/[(x-6)(x-7)]=-2/[(x-9)(x-10)]

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y=(x^2+1)/x+8x/(x^2+1)=a+b

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