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How many real pairs $(a,b)$ are there that solve the system of equation? \begin{align*} a^2+b^2 &= 25, \\ 3(a+b)-ab &= 15. \end{align*}
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How many real pairs $(a,b)$ are there that solve the system of equation? \begin{align*} a^2+b^2 &= 25, \\ 3(a+b)-ab &= 15. \end{align*}
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