Press the button to the left of backspace. Like this: =
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One equals is used in an equation which is true, such as 5 + 3 = 8 Equals equals is used in computer programming as a question as to whether 2 things are equal. Like If x == 4 perform this operation ... If you are referring to 'C' language programming: A single equal sign is an assignment, a double equal sign is a comparison. a = 7; /* An assignment. You are assigning the value of 7 to the variable called 'a' */ if (a == 7) /* A comparison. You are checking if the variable 'a' has the value of 7 */
if there are no comparison signs (equals or inequalities, ie =, >, < etc) then it is an expression, eg "x + 5" If there is a comparison sign which is not equals, then it is an inequality, eg "x > 5"
positive times positive equals positive negative times negative equals positive positive times negative equals negative Substitute "divided by" for "times" in the previous sentences and they are still true.
A fraction that has a different sign to the first fraction.
I've seen less than equal to signs typed on a computer shown as <= but make sure the reader knows you are doing math. If you are writing it with pencil and paper, then use <_ (with the underscore underneath the less than sign)