There are cars and trucks parked in the parking lot. The number of cars is 3.5 times the number of trucks. After a while, 3 cars drive away and 6 trucks come. At this time, the number of cars in the parking lot is 3.5 times that of trucks. 2.3 times the number, then how many cars were parked in the parking lot.
停车场上停有轿车和卡车，轿车辆数是卡车辆数的3.5倍，过了一会儿，3辆轿车开走了，又开来了6辆卡车，这时停车场轿车的辆数是卡车辆数的2.3倍，那么，停车场原来停有多少辆车．
<gadget id="calculator">2.3 * 6</gadget>
<output>13.8</output>

<gadget id="calculator">3 + 13.8</gadget>
<output>16.8</output>

<gadget id="calculator">3.5 - 2.3</gadget>
<output>1.2</output>

<gadget id="calculator">16.8 / 1.2</gadget>
<output>14</output>

<gadget id="calculator">3.5 * 14</gadget>
<output>49</output>

<gadget id="calculator">14 + 49</gadget>
<output>63</output>

<result>63</result>