43Lastly, it should be borne in mind that it follows from the case-law of the Court that Article 17 of Directive 2003/86 requires that applications for reunification be examined on a case-by-case basis (judgments in Chakroun, C‑578/08, EU:C:2010:117, paragraph 48, and K and A, C‑153/14, EU:C:2015:453, paragraph 60), and that the competent national authorities, when implementing Directive 2003/86 and examining applications for family reunification, must make a balanced and reasonable assessment of all the interests in play (see, to that effect, judgment in O and Others, C‑356/11 and C‑357/11, EU:C:2012:776, paragraph 81).
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