Xiao Liang participated in the school mathematics competition, a total of 20 questions, all answered, 5 points were added for each correct answer, and 2 points were deducted for each wrong answer. As a result, Xiao Liang got 86 points. How many questions did he get wrong?
小亮参加学校数学竞赛，共20题，全部作答，每答对一题加5分，每答错一题扣2分，结果小亮得了86分．他答错了多少题？
<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>

<result>2</result>