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If the equation x^4-(12K+5)x^2+16K^2=0 (...

If the equation `x^4-(12K+5)x^2+16K^2=0 (K>0)` has four real solutions which are in AP then the value of `K=a/b` where `a` and `b` are co-prime then find the value of `(a-3b)`

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