Solve the equation: 4x+5%x=(2/13)/(8/39).
解方程：4x+5%x=(2/13)/(8/39)．
<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">8 / 39</gadget>
<output>8/39 = around 0.205128</output>

<gadget id="calculator">(2/13) / (8/39)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 4.05</gadget>
<output>0.185185</output>

<result>0.185185</result>