There are 144 students lined up in a rectangular formation to do exercises. Xiaoming's row is the 4th from the front, the 5th from the back, and the 7th from the left. So which one is it from the right?
有144名学生排成一个长方形队阵做操，小明排的位置从前数是第4个，从后数是第5个，从左数是第7个，那么从右数是第几个？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">144 / 8</gadget>
<output>18</output>

<gadget id="calculator">1 - 7</gadget>
<output>-6</output>

<gadget id="calculator">18 + (-6)</gadget>
<output>12</output>

<result>12</result>