whenever you will add me with any number or subtract me from the same number, you will get the same result. who am I?

Question

whenever you will add me with any number or subtract me from the same number, you will get the same result. who am I?​

Faith · Answer

Answer:   zero ---------------0

Hailey · Answer

Answer:    zero ---------------0

whenever you will add me with any number or subtract me from the same number, you will get the same result. who am I?​