notebook is 6.3 yuan, which is 1.3 yuan cheaper than a pen. How much is a pen? (Solution of column equation)
一本笔记本6.3元，比一支钢笔便宜1.3元，一支钢笔多少元？(列方程解)
<gadget id="calculator">6.3 + 1.3</gadget>
<output>7.6</output>

<result>7.6</result>