The bug on the counting line starts from point 3.8, first climbs 3 squares to the left to 3.5, and then in turn: climbs 20 squares to the right, 4 squares to the left, and 7 squares to the right. If the size of each square is the same, then the small What is the point where the worm finally rests on the counting line
在数射线上的小虫从3.8这点出发，先向左爬3格到3.5，再依次：向右爬20格向左爬4格向右爬7格，如果每格的大小一样，那么小虫最后停留在数射线上的点是多少
<gadget id="calculator">3.8 - 3.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 / 3</gadget>
<output>0.1</output>

<gadget id="calculator">0.1 * 20</gadget>
<output>2</output>

<gadget id="calculator">0.1 * 4</gadget>
<output>0.4</output>

<gadget id="calculator">2 - 0.4</gadget>
<output>1.6</output>

<gadget id="calculator">0.1 * 7</gadget>
<output>0.7</output>

<gadget id="calculator">3.5 + 1.6 + 0.7</gadget>
<output>5.8</output>

<result>5.8</result>