To solve this question using the distributive property is just to expand the given expression by using the multiplication and subtraction operations respectively thus:
[tex]7(4n-9)-3(n-7)[/tex]Expanding further will give:
[tex]28n-63-3n+21[/tex]Collecting like terms:
[tex]\begin{gathered} 28n-3n-63+21 \\ 25n-42 \end{gathered}[/tex]The final equivalent expression is: 25n - 42.