Assertion $\left(A\right): f\left(x\right)=\frac{x^2-16}{x-4}$ & $g\left(x\right)=x+4$ are equal

Reason $\left(R\right):$ Two functions $f$ and $g$ are said to be equal if their domains and ranges are equal and $f\left(x\right)=g\left(x\right),\forall x\in$ domain