Question

All real number that are less than -3 or greater then or equal to 5

Answer 1

If I assume that I can use x to mean "all real numbers that are less than -3 or greater than or equal to 5",

Then I can write this as follows: x<-3 and x>=5

This includes all whole numbers (or integers), all fractions (or rational numbers), and all numbers that cannot be expressed as fractions such as pi, or the square root of 29 (or irrational numbers).