A certain class holds a mathematics competition, with a total of 20 questions, and it is stipulated that 5 points will be awarded for each correct answer, and 2 points will be deducted for each wrong answer. Xiao Ming got 86 points, how many questions did he answer correctly?
某班举办数学竞赛，一共20道题，规定答对一题得5分，答错一题倒扣2分．小明同学得了86分，他答对了多少道题．
<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>