2n+5=15

2n+5=15

     -5  -5

2n/2=10/2

$\boxed{n=5}$

-hihihi

🔮🔮🔮

15-5=10

2n=10

n=5

Same thing as hihihi and KSW said... but more detailed (i think)

$2n+5=15\:\:$

$\mathrm{Subtract\:}5\mathrm{\:from\:both\:sides}$

$2n+5-5=15-5$

$\mathrm{Simplify}$

$2n=10$

$\mathrm{Divide\:both\:sides\:by\:}2$

$\frac{2n}{2}=\frac{10}{2}$

$\mathrm{Simplify}$

$n=5$