To solve for the solutions of your inequality, divide both sides of your inequality by -3 in order to isolate the value of x:
-3x≥36 ÷-3 ÷-3
x≤12 **Note: in inequalities, if you ever divide or multiply a number that is negative, you must flip the inequality sign. In this case, because you have divided -3 from both sides, you must flip the inequality sign from ≥ to ≤.
Therefore, your solutions to your inequality would be x≤12.