Solve the equation and check: 9x+1.4=5.9.
解方程并检验：9x+1.4=5.9．
<gadget id="calculator">9 * 0.5</gadget>
<output>4.5</output>

<gadget id="calculator">1.4 - 1.4</gadget>
<output>0</output>

<gadget id="calculator">4.5 + 0</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 / 9</gadget>
<output>0.5</output>

<result>0.5</result>