Question

How do you solve n(n−4)+n(n+8)=n(n−13)+n(n+1)+16?

Answer 1

(n-4)+n (n+8)=n (n-13)+n (n+1)+16

n-4+2n+8n=2n-13+2n+1n+16

11n-4=5n+3

11n -5n =3+4

6n=7

n=7/6