The garden workers planted a tree every 4 meters on both sides of a section of road. A total of 74 trees were planted. Now it is necessary to plant a tree every 6 meters. How many trees do not need to be transplanted?
园林工人在一段公路的两边每隔4米栽一棵树，共栽了74棵，现在要改成每隔6米栽一棵树，那么不用移栽的树有多少棵？
<gadget id="calculator">74 / 2</gadget>
<output>37</output>

<gadget id="calculator">37 - 1</gadget>
<output>36</output>

<gadget id="calculator">36 * 4</gadget>
<output>144</output>

<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>