If 1.5x+3=9, then 2x-0.7=how much.
如果1.5x+3=9，那么2x-0.7=多少．
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">6 / 1.5</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">8 - 0.7</gadget>
<output>7.3</output>

<result>7.3</result>