One wall of the library is 9 meters long and 6 meters wide. There are 2 windows on the wall, and the area of each window is 4 square meters. Now you want to paint this wall, how many square meters is the painted area?
图书室的一面墙壁长9米，宽6米，墙上有2扇窗，每扇窗的面积是4平方米．现在要粉刷这面墙壁，粉刷的面积是多少平方米？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

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

<gadget id="calculator">54 - 8</gadget>
<output>46</output>

<result>46</result>