Solve the equation: 1-(4/5)x-(1/5)=(1/2).
解方程：1-(4/5)x-(1/5)=(1/2)．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/10) / (4/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>