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If DeltaABC, if (c+a)/12=(a+b)/14=(b+c)/...

If `DeltaABC,` if `(c+a)/12=(a+b)/14=(b+c)/18`, then find vaue of `(7r_(1)-r_(2))/(11r)` is

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`(c+a)/12=(a+b)/14=(b+c)/18=s/11`
`B=c=18/11s`
`implies2s-a=18/11s`
`impliess-a=7/11s`
`r_(1)=(Delta)/(s-a)=(11Delta)/(7s)=11/7r`
`a+c=(12s)/11`
`s-b=s/11`
`r_(2)=(Delta)/(s-b)=(11Delta)/s=11r`
`implies(7r_(1)-r_(2))/11=(11r-11r)/(11r)=0`
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