There is a road to be built in the village, the full length (3/7) has been built, and there is still 14km away from the midpoint. How many kilometers is the total length of this road?
村里要修一条公路，已经修了全长的(3/7)，离中点还有14km，这条公路全长为多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">14 / (1/14)</gadget>
<output>196</output>

<result>196</result>