Uncle Li bought a piece of iron wire and used it up to 5.4 meters. The rest is 3.45 meters shorter than the used one. How long was the wire originally?
李叔叔买了一根铁丝，用去5.4米，剩下的比用去的少3.45米，这根铁丝原来长多少米？
<gadget id="calculator">5.4 - 3.45</gadget>
<output>1.95</output>

<gadget id="calculator">1.95 + 5.4</gadget>
<output>7.35</output>

<result>7.35</result>