Solve the equation: (4/5)x+(2/5)x=(1/2).
解方程：(4/5)x+(2/5)x=(1/2)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) + (2/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/2) / (6/5)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>