Solve the equation: (2/5)+20%x=5.
解方程：(2/5)+20%x=5．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 - (2/5)</gadget>
<output>23/5 = around 4.6</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(23/5) / (1/5)</gadget>
<output>23</output>

<result>23</result>