To build a road, the full length (4/7) has been built, and the unrepaired one is 28 kilometers shorter than the one that has been repaired. How many kilometers is the total length of this road?
修一条公路，已修了全长的(4/7)，未修的比已修的少28千米，这条公路全长多少千米？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">28 / (1/7)</gadget>
<output>196</output>

<result>196</result>