84 students in class 6 and 5 are in the final test, (1/3) students are "excellent", (1/2) students are "good", (1/7) students are "pass", and those who fail how many people?
六5班84名同学在期末检测中，(1/3)的同学得"优"，(1/2)的同学得"良"，(1/7)的同学得"及格"，不及格的多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/3) - (1/2) - (1/7)</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">84 * (1/42)</gadget>
<output>2</output>

<result>2</result>