The bus departs from the starting point. At the first stop, 10 people get off and 5 people get on the bus. When the bus stops at the second stop, only 8 people get on the bus. When it stops at the third stop, only 7 people get off. There are 28 people, how many passengers are there when the car leaves at the starting point?
公共汽车从起点开出，停靠第一站有10人下车，5人上车，停靠第二站时只有8人上车，停靠第三站时，只有7人下车，这时车上还有28人，车在起点站开出时有乘客多少人？
<gadget id="calculator">7 - 8 - 5</gadget>
<output>-6</output>

<gadget id="calculator">28 + (-6) + 10</gadget>
<output>32</output>

<result>32</result>