3*1.5+2x=11.5．
3*1.5+2x=11.5．
<gadget id="calculator">3 * 1.5</gadget>
<output>4.5</output>

<gadget id="calculator">11.5 - 4.5</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>