If 3x-1.5x=2.7, then x=how much.
如果3x-1.5x=2.7，那么x=多少．
<gadget id="calculator">3 - 1.5</gadget>
<output>1.5</output>

<gadget id="calculator">2.7 / 1.5</gadget>
<output>1.8</output>

<result>1.8</result>