natalyabryukhova

(2^(3n+5+3)*7^(3n+5+1))/14^(3n+5)=

(2^(3n+5)*3^3)*7(3n+5)*7)/14(3n+5)=

14^(3n+5)*3^3*7/14(3n+5)=

14^(3n+5) - сокращаем

=3^3*7=189