If an expression has to be written in the form of equation ,then we use equal to sign.
For, example
⇒ The sum of a number 4, and 2 times a number is 6.Find the number.
Answer
Writing in the form of equation we will use equal to sign
Let the number be x.
→4 +2x=6----Here we have used equal to sign, while writing expression in equation form.