Solve the equation: (1-(1/6))x*(4/5)=500.
解方程：(1-(1/6))x*(4/5)=500．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * (4/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(4/5) - (2/15)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">500 / (2/3)</gadget>
<output>750</output>

<result>750</result>