A piece of iron wire, cut off the full length (2/5) for the first time, and cut off 2 meters less than the first time for the second time. At this time there are 10 meters left. How long is this wire?
一根铁丝，第一次截去全长的(2/5)，第二次比第一次少截去2米．这时还剩10米．这根铁丝原来长多少米？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / (1/5)</gadget>
<output>40</output>

<result>40</result>