The new semester is about to start. Zhang Hua and Li Ming bought some school supplies. Zhang Hua bought two pens and two binders. Li Ming bought the same three pens and two binders. The ratio of money to money is 7:9. If a binder costs 6 yuan, how much is a pen?
新学期就要开学了，张华和李明买了一些学习用品，张华买了两支钢笔和两本活页夹，李明买了同样的三支钢笔和两本活页夹，他们所用去的钱数比是7：9，如果一本活页夹是6元，那么一支钢笔多少元钱？
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(7/9) * 12</gadget>
<output>28/3 = around 9.333333</output>

<gadget id="calculator">12 - (28/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">(7/9) * 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">(7/3) - 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(8/3) / (1/3)</gadget>
<output>8</output>

<result>8</result>