Let \(k, a_2, a_3\) be a geometric sequence with common ratio \(p \neq 1,\) and let \(k, b_2, b_3\) be a geometric sequence with common ratio \(r \neq 1.\) If \(a_3-b_3=3(a_2-b_2)\) and \(p \neq r,\) then find p+r
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