Zhang Li bought 3 pencils and 5 exercise books, and the total cost was 8.4 yuan. It is known that each exercise book is 1.2 yuan. How much is each pencil?
张丽买了3支铅笔和5本练习本，共用了8.4元，已知每本练习本1.2元，每支铅笔多少元？
<gadget id="calculator">1.2 * 5</gadget>
<output>6</output>

<gadget id="calculator">8.4 - 6</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 / 3</gadget>
<output>0.8</output>

<result>0.8</result>