Abcdefghijklmnopqrstuvwxy and z now which letter(s) did I repeat ?
If is
x > 2 or x < 7 ⇒ x is any real number
If is
x > 2 and x < 7 ⇒ 2 < x < 7
A set of all numbers that are greater than 2 and less than 7.
Look at the picture.
[-3, infinity)
It is greater than or equal to -3 and goes on to infinity
Its 0.5793 with the bar over the 3
I'm guessing you meant the sum of a number AND 6? If so:
x+6=y or just x+6
x is a variable for "a number" and you add 6 to it. The y on the other side of the equals sign is because the sum (number you get when adding) is unknown due to the value of the x variable being unknown.