A rectangle is (20/5) decimeters long and (7/5) decimeters wider than it is wide. What is the perimeter of the rectangle?
一个长方形，长是(20/5)分米，比宽多(7/5)分米，长方形的周长是多少分米？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">4 - (7/5)</gadget>
<output>13/5 = around 2.6</output>

<gadget id="calculator">(13/5) + 4</gadget>
<output>33/5 = around 6.6</output>

<gadget id="calculator">(33/5) * 2</gadget>
<output>66/5 = around 13.2</output>

<result>66/5 = around 13.2</result>