(9/2) minus a number equals 3, what is this number?
(9/2)减去一个数等于3，这个数是多少．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) - 3</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>