#### Answer

$32$

#### Work Step by Step

Using the distributive property and combining like terms, the given expression simplifies to:
$5(n+3)-(n+4)-n$
=$5n+15-n-4-n$
=$5n-n-n-4+15$
=$3n+11$
We then substitute $n=7$ in the expression and simplify:
$3n+11$
=$3(7)+11$
=$21+11$
=$32$