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There is a point (p,q) on the graph of `f(x)=x^2` and a point `(r , s)` on the graph of `g(x)=(-8)/x ,w h e r ep >0a n dr > 0.` If the line through `(p , q)a n d(r , s)` is also tangent to both the curves at these points, respectively, then the value of `P+r` is_________.

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