Solve equation 5/(X+16.81)=(1/5).
解方程5/(X+16.81)=(1/5)．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 16.81</gadget>
<output>3.362</output>

<gadget id="calculator">5 - 3.362</gadget>
<output>1.638</output>

<gadget id="calculator">1.638 / (1/5)</gadget>
<output>8.19</output>

<result>8.19</result>