snail climbs up a 10-meter-high bamboo pole, climbs up 3 meters during the day, and slides down 2 meters at night. How many days does it take for the snail to climb to the top of the bamboo pole?
一只蜗牛沿着10米高的竹竿往上爬，白天向上爬3米，到夜里往下滑2米，蜗牛第多少天能爬到竹竿的顶端．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">7 * 1</gadget>
<output>7</output>

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

<result>8</result>