The length of a rectangle is (6/7) meters, and it is (2/7) meters longer than its width. What is the perimeter of the rectangle in meters?
一个长方形的长是(6/7)米，比宽长(2/7)米，这个长方形的周长是多少米？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(6/7) - (2/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) + (6/7)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">(10/7) * 2</gadget>
<output>20/7 = around 2.857143</output>

<result>20/7 = around 2.857143</result>