Notice that if x is negative, thenis negative and, therefore, can not be greater or equal to 5. Hence, the solution set {x} is among positive real numbers. Assuming that x is positive, multiply both sides of >=5 by x. Since x is positive, you can keep the same inequality sign. So, your inequality becomes 6 >= 5x. Now divide both sides by the positive number 5. You will get an equivalent inequality x <= .