Solve the equation: (x+0.4)*6=5.4.
解方程：(x+0.4)*6=5.4．
<gadget id="calculator">0.4 * 6</gadget>
<output>2.4</output>

<gadget id="calculator">5.4 - 2.4</gadget>
<output>3</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>