You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>Let $k$ be a real number such that the system
\begin{align*} |25+20i-z|&=5\\ |z-4-k|&=|z-3i-k| \\ \end{align*}
has exactly one complex solution $z$. The sum of all possible values of $k$ can be written as $\frac{m}{n},$ where $m$ and $n$ are relatively prime positive integers. Find $m+n.$ Here $i=\sqrt{-1}.$ You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
77
Let $k$ be a real number such that the system
\begin{align*} |25+20i-z|&=5\\ |z-4-k|&=|z-3i-k| \\ \end{align*}
has exactly one complex solution $z$. The sum of all possible values of $k$ can be written as $\frac{m}{n},$ where $m$ and $n$ are relatively prime positive integers. Find $m+n.$ Here $i=\sqrt{-1}.$ You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val