Simplifying probablity equation based on its cumulative distribution function (CDF)

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How can I simplify the following probability equation based on cumulative distribution function of X:

P(X>a)>b

which P is the probability of X and X has a known probability distribution function and a & b are real positive numbers.

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$$P(X>a)>b$$

$$-P(X>a)<-b$$ $$1-P(X>a)<1-b$$

$$P(X \le a)<1-b$$

$$F_X(a)<1-b$$