The school has to paint the walls and ceiling of a classroom. It is known that the length of the classroom is 9 meters, the width is 6 meters, and the height is 3 meters. The area after deducting the doors and windows is 12 square meters. How many square meters is the area to be painted?
学校要粉刷一间教室的四壁和天花板．已知教室的长是9米，宽6米，高是3米，扣除门窗的面积12平方米，要粉刷的面积是多少平方米？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">9 * 3 * 2</gadget>
<output>54</output>

<gadget id="calculator">6 * 3 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 - 12</gadget>
<output>24</output>

<gadget id="calculator">54 + 54 + 24</gadget>
<output>132</output>

<result>132</result>