## Elementary Algebra

$32$
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: $3n+11$ =$3(7)+11$ =$21+11$ =$32$