Simple....
so you have...
![- \frac{s}{3} \geq 6](/tpl/images/0332/7795/51bb5.png)
You want to isolate the variable, s, so multiply both sides of the equation by 3 to get rid of the fraction...
![3*- \frac{s}{3} \geq 6*3](/tpl/images/0332/7795/99ee2.png)
Leaving you with...
-s
![\geq 18](/tpl/images/0332/7795/a7cfb.png)
Now you can divide...but remember when you divide by a negative for any equality the sign flips....
Making your answer....
![s \leq -18](/tpl/images/0332/7795/847e6.png)
Thus, your answer.