2 h + 4 − 5 h = − 3 h + 4 − 3 h + 4 = − 3 h + 4
identity
The equation 2 h + 4 − 5 h = − 3 h + 4 simplifies to − 3 h + 4 = − 3 h + 4 , indicating that both sides are the same. This means the equation is an identity, valid for all values of h . Therefore, it does not impose any restrictions on h , making it true for all real numbers.
;