identity is a special information related to a particular person and equation is a way of writing a formula with the sign (=)
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Expression has no answer. a equation has an answer
Three lines between two equations means that there is an identity present. This means that whatever numbers you put into the equation it will always equal the equation on the other side.
an equation has an equals sign.
An expression has no equal sign whereas an equation does have an equal sign
Difference in math means subtraction. To express the difference between 6 and 2 you would use the equation 6 - 2 = 4.