Given $ab+bc+cd+da = 30$ and $b+d = 5$, find $a+c$.
Question:
Given $ab+bc+cd+da = 30$ and $b+d = 5$, find $a+c$.
Answer:
Let's think step by step.

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Given $ab+bc+cd+da = 30$ and $b+d = 5$, find $a+c$.
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