If 2x+1=3.24, then 3x=how much
如果2x+1=3.24，那么3x=多少
<gadget id="calculator">3.24 - 1</gadget>
<output>2.24</output>

<gadget id="calculator">2.24 / 2</gadget>
<output>1.12</output>

<gadget id="calculator">3 * 1.12</gadget>
<output>3.36</output>

<result>3.36</result>