Guangming Primary School participated in the tree planting activity. On the first day, 75 people participated. On the second day, the number of participants was twice that of the first day and 12 people participated. How many people participated in the second day?
光明小学参加植树活动，第一天有75人参加，第二天参加的人数是第一天的2倍少12人，第二天共有多少人参加？
<gadget id="calculator">75 * 2</gadget>
<output>150</output>

<gadget id="calculator">150 - 12</gadget>
<output>138</output>

<result>138</result>