There is a wall of a study room with a length of 4 meters and a width of 3 meters. There is a window on the wall with an area of 3 square meters. Now this wall is to be painted, how many square meters is the area to be painted?
有一个书房的一面墙，长4米，宽3米，墙上有一扇窗户，面积是3平方米，现在要粉刷这面墙，要粉刷的面积是多少平方米？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>