So the left center equals greater than or equal to and so these guys cancel out negative 3 divided by negative 3 equals 1, so we have z is greater than or equal to 18 over negative 3 is negative 6 and remember, it's this constraint OR this constraint and this constraint right over here boils down to this and this one boils down to this so our solution set z is less than 4 OR z is greater than or equal to negative -6.