piece of iron wire, after cutting off its (5/9), there are 8 meters left, what is the length of this iron wire in meters?
一根铁丝，剪去它的(5/9)后，还剩8米，原来这根铁丝长是多少米．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">8 / (4/9)</gadget>
<output>18</output>

<result>18</result>