512^(1/9)*10-2*8v

(Weird my previous answer seems to have disappeared.)

Your input: 512^(1/9)*10-2*8v

Intepretation: \(512^{\frac{1}{9}}\cdot 10-2\cdot 8v\)

We know that \(2^9=512\), therefore \(512^{\frac{1}{9}}=2\)

Ans: \(2*10-2*8v\)

\(=20-16v\)

\(=4(5-4v)\)

Q.E.D.