how come ((4^6-4^5)/3)^4 equal 4^20?

thank you man

How come ((4^6-4^5)/3)^4 equal 4^20 ?

$$\left(\dfrac{4^6-4^5}{3} \right)^4 \\ \\
=\left(\dfrac{4^5\cdot(4-1)}{3} \right)^4 \\ \\
=\left(\dfrac{4^5\cdot \not{3} }{\not{3}} \right)^4 \\ \\
=\left( 4^5 \right)^4 \\ \\
=4^{5\cdot 4} \\ \\
=4^{20}$$