You solve in inequalities just like how you solve regular equation although when you're on the last step and you're about to multiply or divide to find x if you divide you flip the inequality sign and if you multiply you keep it the same.
Example:-4x -9 ≥ -3
+9 +9
-4x ≥ 6
÷-4 ÷-4
x ≤- 1.5
Hope this helps
