$$\frac{x^{20}(x-4)}{5x^2} + \frac{4x^{20}}{5x^2}$$ is equivalent to …

Question

Prompt

\frac{x ^{20} ( x - 4 )}{5 x ^{2}} + \frac{4 x ^{20}}{5 x ^{2}}

is equivalent to

\frac{1}{5} x^{c}

, where

c

is a constant and

x > 0

. What is the value of

c