There are 173 students in the third grade of Xinxing Primary School, of which 58 participated in the English competition, 67 participated in the mathematics competition, and 42 participated in both competitions. How many students did not participate in the two competitions?
新星小学三年级共有学生173人，其中有58人参加了英语竞赛，有67人参加了数学竞赛，有42人两项竞赛都参加了，两项竞赛没有参加的有多少人？
<gadget id="calculator">42 - 58 - 67</gadget>
<output>-83</output>

<gadget id="calculator">173 + (-83)</gadget>
<output>90</output>

<result>90</result>