Answer :

n+3/21=14/21
n=11/21
Hope this helps!
[tex]n+ \frac{1}{7}= \frac{2}{3}\\ \\n = \frac{2}{3}-\frac{1}{7}\\ \\n=\frac{14}{21}-\frac{3}{21}\\ \\n=\frac{11}{21}[/tex]


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