If 18-3x=9, then, 1.5x+7=how much.
如果18-3x=9，那么，1.5x+7=多少．
<gadget id="calculator">18 - 9</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

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

<gadget id="calculator">4.5 + 7</gadget>
<output>11.5</output>

<result>11.5</result>