There is an iron wire, half of which is used up and 1 meter is lost, and the result is 5 meters left, how many meters is the original length of this iron wire?
有一根铁丝，用去了它的一半少1米，结果剩下5米，问这根铁丝原来长多少米？
<gadget id="calculator">5 - 1</gadget>
<output>4</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">4 / (1/2)</gadget>
<output>8</output>

<result>8</result>