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Solving high school math problems: propositions and their relationships. Thank you! You'd better help me see what's wrong with my process, thank you! )
A-b- empty set is a false proposition, so A-b is not equal to empty set, and your first step is wrong.

So a is not an empty set.

Dale, he is greater than or equal to 0.

A is less than or equal to-1 or greater than or equal to 1.5.

Because a and b intersect, x is less than 0.

X is less than or equal to-1

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