(2n+9)(2n+9)-(2n+5)(2n+5)=0

Solution for (2n+9)(2n+9)-(2n+5)(2n+5)=0 equation:

(2n+9)(2n+9)-(2n+5)(2n+5)=0

We multiply parentheses ..

(+4n^2+18n+18n+81)-(2n+5)(2n+5)=0

We get rid of parentheses

4n^2+18n+18n-(2n+5)(2n+5)+81=0

We multiply parentheses ..

4n^2-(+4n^2+10n+10n+25)+18n+18n+81=0

We add all the numbers together, and all the variables

4n^2-(+4n^2+10n+10n+25)+36n+81=0

We get rid of parentheses

4n^2-4n^2-10n-10n+36n-25+81=0

We add all the numbers together, and all the variables

16n+56=0

We move all terms containing n to the left, all other terms to the right

16n=-56

n=-56/16

n=-3+1/2