Xiaoqiao brought 543 yuan. After buying 7 notebooks, there is 459 yuan left. How much is each notebook?
小巧带了543元，买了7本笔记本后，还剩459元，每本笔记本多少元？
<gadget id="calculator">543 - 459</gadget>
<output>84</output>

<gadget id="calculator">84 / 7</gadget>
<output>12</output>

<result>12</result>