The safety knowledge contest organized by Dongfeng Primary School has a total of 20 questions. For each correct answer, 5 points will be awarded. If a wrong answer is not only not scored, but also 2 points will be deducted. Li Ming scored 86 points in this competition. How many points did he answer correctly? question?
东风小学组织的安全知识竞赛共有20道题目，每答对一题得5分，答错一题不仅不得分，而且还要倒扣2分，这次竞赛李明得了86分，问他答对了几道题？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 86</gadget>
<output>14</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">14 / 7</gadget>
<output>2</output>

<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<result>18</result>