A tourist group rents a car to go out, and the car rental fee is borne by the passengers on average. As a result, the number of passengers is exactly equal to the amount of the fare payable by each person. Later, 6 people were reduced, so the fare payable by each person increased by 12 yuan compared with the original one. How much is the rental fee for this car.
某旅游团租一辆车外出，租车费由乘车人平均负担，结果乘车人数与每人应付车费的元数恰好相等．后来减少了6人，这样每人应付车费比原来增加了12元．这辆车的租车费是多少元．
<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>