For a rope, half of the length is cut off for the first time and 6 meters less than half of the length is cut off for the second time, leaving 36 meters left. Please; how long is this rope?
一根绳子，第一次剪去全长的一半少6米，第二次剪去全长的一半多6米，这时还剩下36米．求；这根绳子原来有多长？
<gadget id="calculator">6 - 6</gadget>
<output>0</output>

<gadget id="calculator">36 + 0</gadget>
<output>36</output>

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

<gadget id="calculator">36 / (1/2)</gadget>
<output>72</output>

<result>72</result>