Evaluate $2^{-n}(2^n-2^{1+n})$

Question

The answer is $-1$, but how does one expand and simplify this expression to find this answer (what are the steps)?

Answer 1

HINT : $$A(B+C)=AB+AC$$ and$$2^a\times 2^b=2^{a\color{red}{+}b}.$$

Answer 2

$$2^{-n}(2^n-2^{n+1})=2^{n-n}-2^{n+1-n}=1-2=-1$$