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Let d bet the minimum value of f(x)=5x^...

Let d bet the minimum value of `f(x)=5x^2-2x+26/5 and f(x)` is symmetric about `x=r`. If `sum_(n=1)^oo(1+(n-1)d)r^(n-1)` equals, `p/q,` where p and q are relative prime, then find the value of `(3q-p).`

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