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a) 27-11x>14x-18
27+18>14x+11x
45>25x
45/25>x
9/5>x
Rpta: <-∞,9/5>
b) 42 - 13y < 15y - 19
42+19<15y+13y
61<28y
61/28<y
Rpta: <-∞,61/28>
c) 33 - 12z ≥ 4z -97
33+97≥4z+12z
130≥16z
130/16z≥z
65/8≥ z
Rpta: < -∞,65/8 ]
d) 21- 8m ≥ 6m + 49
21-49≥6m+8m
-28≥14m
-28/14≥m
-2≥m
Rpta: <-∞,-2]