The given expression is,
[tex]7n+14=-21[/tex]
So bringing "14" to the other side of the euals,
[tex]\begin{gathered} 7n=-21-14 \\ =-35 \end{gathered}[/tex]
On division,
[tex]\begin{gathered} 7n=-35 \\ n=-\frac{35}{7}=-5 \end{gathered}[/tex]
Now, let us substitute -5 for n,
[tex]7\times(-5)=-35[/tex]
Hence checked.
