Question 768714
9{[4(n-4)+17]-[3(2n-2)+5]}
=9{[4n-16+17]-[6n-6+5]}
=9{[4n+1]-[6n-1]}
=9{4n+1-6n+1}
=9{4n-6n+1+1}
=9{-2n+2}
=-18n+18
=18(-n+1)