a+b:b+c:c+a=6:7:6 and a+b+c=14 then the value of c
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let a+b=6k,b+c=7k,c+a=6k
a+b+b+c+c+a=6k+7k+6k=19k
2(a+b+c)=19k
a+b+c=19k/2
19k/2=14
k =(14×2)÷19
k = 28/19
a+b=(28×6)÷19=168/19
c=(a+b+c)-(a+b)=(28/19)×(19/2)-168/19
=(266-168)/19=98/19
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