The price of a pen is 12.5 yuan, which is 6.5 yuan more expensive than a notebook. How much does a notebook cost? (column equation solution)
一支钢笔的价钱是12.5元，比一本笔记本贵6.5元．一本笔记本的价钱是多少元？(列方程解答)
<gadget id="calculator">12.5 - 6.5</gadget>
<output>6</output>

<result>6</result>