On an 84-meter-long road, a tree was originally planted every 4 meters. Now it is necessary to plant a tree every 6 meters, how many trees are kept in the original position from the beginning to the end? (plant trees at both ends)
一条84米长的路上，原来每隔4米种一棵树．现在要改成每隔6米种一棵树，从头到尾有多少棵树保留在原来的位置上？(两端均种树)
<gadget id="calculator">84 / 12</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>