Solution: (1/20)-(1/10)x=x: (1/5).
解：(1/20)-(1/10)x=x：(1/5)．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/20) * (1/5)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * (1/5)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/50) + 1</gadget>
<output>51/50 = around 1.02</output>

<gadget id="calculator">(1/100) / (51/50)</gadget>
<output>1/102 = around 0.009804</output>

<result>1/102 = around 0.009804</result>