If you expand the left hand side, the inequality becomes
[tex] 3n+18 \geq 3n+8 [/tex]
As you can see, [tex]3n[/tex] appears on both sides, which means that it cancels out. You can subtract [tex]3n[/tex] from both sides to get
[tex] 18 \geq 8 [/tex]
and this is clearly always true. If you interpreted the inequality with words, it would sound like
"For which values of n is 18 greater than 8"
Since the inequality does not depend on n anymore and the remaining part is true (18 is indeed greater than 8), every possible value of n satisfies the inequality.
