We have the following expression:
[tex]n+\frac{5}{5}=f+\frac{9}{9}[/tex]Since 5/5 and 9/9 are equal to 1, we get:
[tex]n+1=f+1[/tex]Subtracting 1 on both sides:
[tex]\begin{gathered} n+1-1=f+1-1 \\ n=f \end{gathered}[/tex]dividing by 5 on both sides:
[tex]\frac{n}{5}=\frac{f}{5}[/tex]It means that n/5 = f/5
