Two road repairing teams jointly repair a road. Team A has repaired the full length (2/7) and Team B has repaired the full length (3/5). What fraction of the road is left to be repaired?
两个修路队合修一条公路，甲队已经修了全长的(2/7)，乙队已经修了全长的(3/5)，这条公路还剩几分之几没修？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (2/7) - (3/5)</gadget>
<output>4/35 = around 0.114286</output>

<result>4/35 = around 0.114286</result>