The equals sign = was invented in 1557 by Welsh mathematician Robert Recorde. In his book, The Whetstone of Witte, he wrote, "To avoid the tedious repetition of these words: is equal to; I will set a pair of parallel lines thus, =, because no two things can be more equal.
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If it doesn't have an "equals" sign, then it's not an equation. It's an "expression".
An expression does not have an equals sign, An equation has an equals sign,
Equals sign demonstrates that something is the same as something, or equal to.
This is an equals sign with a diagonal line through it ≠ .
The = sign