During the activity of "cleaning up white garbage and advocating low-carbon life", the fourth and fifth graders cleaned up (5/7) kilograms of waste plastics, which was (2/3) kilograms less than that of the fifth graders, and the two grades cleaned up altogether How many kilograms of waste plastic?
四、五年级同学在"清理白色垃圾，倡导低碳生活"的活动中，四年级同学清理废塑料(5/7)千克，比五年级少清理(2/3)千克，两个年级一共清理废塑料多少千克？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/7) + (2/3) + (5/7)</gadget>
<output>44/21 = around 2.095238</output>

<result>44/21 = around 2.095238</result>