Answer :

luana
[tex]2(2n+5)=12\\\\ 4n+10=12\ \ \ \ | subtract\ 10\\\\ 4n=2\ \ \ \ | divide\ by\ 4\\\\ n=\frac{2}{4}=\frac{1}{2}[/tex]
2(2n+5)=12
4n+10=12
    -10 -10
-----------------
4n   =   2
4n/4 =2/4
n=0.5