A wire, for the first time use (1/2) and 2 meters of the full length, for the second time use the remaining (1/2) and 2 meters, and finally there are 13 meters left. How long is this wire originally?
一根电线，第一次用去全长的(1/2)又2米，第二次用去剩下的(1/2)又2米，最后还剩下13米．这根电线原来长多少米？
<gadget id="calculator">13 + 2</gadget>
<output>15</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 / (1/2)</gadget>
<output>30</output>

<gadget id="calculator">30 + 2</gadget>
<output>32</output>

<gadget id="calculator">32 / (1/2)</gadget>
<output>64</output>

<result>64</result>