If 3χ+5=9.5, then 4-2χ=how much.
如果3χ+5=9.5，那么4-2χ=多少．
<gadget id="calculator">9.5 - 5</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 / 3</gadget>
<output>1.5</output>

<gadget id="calculator">2 * 1.5</gadget>
<output>3</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<result>1</result>