Cut off half of a rope, then cut off the remaining half, and then cut off 5 meters, leaving 2 meters, what is the original length of the rope?
一根绳子剪去一半，再剪去余下的一半后，再剪去5米，还剩2米，这根绳子原来长多少米．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

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

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

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7 / (1/4)</gadget>
<output>28</output>

<result>28</result>