Solve the equation: (2/15)x+(1/6)x=(2/5).
解方程：(2/15)x+(1/6)x=(2/5)．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

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

<gadget id="calculator">(2/15) + (1/6)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) / (3/10)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>