A wire, cut off 25.7 meters. The truncated one is 12.3 meters shorter than the rest. How long is this wire originally?
一根电线，截去25.7米．截去的比剩下的短12.3米．这根电线原来长多少米？
<gadget id="calculator">25.7 - 12.3</gadget>
<output>13.4</output>

<gadget id="calculator">13.4 + 25.7</gadget>
<output>39.1</output>

<result>39.1</result>