snail first climbs 9 mm to the west, then 6 mm to the east, then 3 mm to the west, and finally 7 mm to the east. At this time, is the snail east or west of the starting point? How many millimeters from the starting point?
一只蜗牛先向西爬9毫米，再向东爬6毫米，又向西爬3毫米，最后向东爬7毫米，这时蜗牛在起点的东面还是西面？离起点几毫米？
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<result>1</result>