For a bundle of wires, half of the total length is used for the first time, more than 4 meters, the remaining half is used for the second time, less than 8 meters, 12 meters are used for the third time, and 11 meters are left in the end. How many meters is this bundle of wires?
一捆电线，第一次用去全长的一半多4米，第二次用去剩下的一半少8米，第三次用去12米，最后还剩11米．这捆电线原有多少米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">11 + 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 + 4</gadget>
<output>34</output>

<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<result>68</result>