It is planned to finish repairing one road in 7 days. It will be completed in 3 days (3/10). At this time, the unrepaired road is 84 meters longer than the completed one. How many meters will be repaired every day to complete the repair on time?
计划7天修完-条路.3天修完(3/10)，这时没修的比修完的多84米，以后每天修多少米，才能按时修完？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10) - (3/10)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">84 / (2/5)</gadget>
<output>210</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">(7/10) / 4</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">210 * (7/40)</gadget>
<output>147/4 = around 36.75</output>

<result>147/4 = around 36.75</result>