If 3x+5=9.5, then 4-2x=how much.
若3x+5=9.5，则4-2x=多少．
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) * 2</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">4 - (8/3)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>